Mast forward reach fork truck

Abstract

The application provides a portal forward-moving forklift, which comprises a left support and a right support, wherein the left support and the right support are respectively provided with a rack on opposite inner sides; a portal is provided with a push-pull block and a gear on the left side and the right side respectively; a left supporting leg and a right supporting leg are respectively movable up and down relative to the left support and the right support between a first vertical position and a second vertical position; a push-pull rod is movable back and forth relative to the left support and the right support between a first translation position and a second translation position; the front end of the push-pull rod located at the first translation position does not contact the left supporting leg and the right supporting leg; 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 a downward pressure to the left supporting leg and the right supporting leg, so that the left supporting leg and the right supporting leg move downward to the second vertical position, and the push-pull rod moving to the second translation position is disconnected with the push-pull block, so that the push-pull block continues to move forward. According to the forklift provided by the application, the center of gravity of the forklift can be moved backward, and the forklift is easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of material handling equipment, and more particularly to a reach truck. Background Technology

[0002] With the rapid development of my country's manufacturing and logistics industries, automated warehouse storage has become a basic requirement for all industries. Reach trucks, especially AGV forklifts, are becoming increasingly widely used due to their environmental protection and energy saving, low noise, high lifting capacity, and small working space.

[0003] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art:

[0004] Currently, the only way to adjust the center of gravity of reach trucks is by adding counterweights or lengthening the chassis to balance the center of gravity and stabilize the vehicle. Furthermore, the mast movement of reach trucks currently mostly uses hydraulic cylinders, which suffers from problems such as hydraulic oil leakage and inconvenient maintenance.

[0005] Therefore, a mast reach truck is needed to at least partially solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a mast reach truck that shifts the forklift's center of gravity to the rear, making it easier to maintain.

[0007] This invention provides a mast reach truck, the forklift comprising a chassis and a mast;

[0008] The base frame includes a left support, a right support, and a connecting frame that is connected to the left support and the right support at both ends respectively; the left support and the right support are respectively provided with racks along the front-back direction on their opposite inner sides;

[0009] The gantry is positioned between the left and right supports and is movable relative to the left and right supports in the front-back direction; the gantry is provided with push-pull blocks and gears located below the push-pull blocks on the left and right sides respectively, and the two gears on both sides of the gantry can rotate synchronously and mesh with the racks on the corresponding sides;

[0010] A left support leg and a right support leg, respectively located in front of the respective drive wheels of the left and right supports, are configured to move vertically between a first vertical position and a second vertical position relative to the left and right supports, respectively; and

[0011] Push-pull rods are respectively disposed inside the left and right supports along the front-back direction. The push-pull rods are configured to be movably connected to the push-pull blocks between a first translational position and a second translational position relative to the left and right supports, and move synchronously back and forth under the push-pull force applied by the push-pull blocks in the front-back movement.

[0012] In this configuration, the front end of the push-pull rod located at the first translational position does not contact the left and right support legs, so that the left and right support legs are in the first vertical position. When the push-pull block pushes the push-pull rod forward to the second translational position, the front end of the push-pull rod applies downward pressure to the left and right support legs, so that the left and right support legs move downward to the second vertical position. The push-pull rod that has moved to the second translational position can disconnect from the push-pull block, so that the push-pull block can continue to move forward, and the front end of the push-pull rod keeps pressing down on the left and right support legs, so that the left and right support legs remain in the second vertical position.

[0013] According to the present invention, a mast reach truck has a left support leg and a right support leg respectively located in front of the drive wheels of its left and right supports. The left and right support legs can move up and down under the combined action of push-pull blocks and push-pull rods on their respective sides. When the push-pull blocks push the push-pull rods forward to the second translational position, the left and right support legs can move downward to the second vertical position, allowing them to be supported on the ground or other work surfaces. This is equivalent to adding a support point at the front of the forklift, shifting the forklift's center of gravity backward, and enhancing the stability of the forklift during operation. Furthermore, the push-pull rod can be disconnected from the push-pull blocks when it reaches the second translational position, allowing the push-pull blocks to continue moving forward without affecting the mast's normal forward movement. In addition, compared to the existing hydraulic transmission method, the mast uses a gear and rack transmission method, which is easier to maintain and has higher transmission efficiency.

[0014] The beneficial effects that can be obtained by utilizing the technical solution according to the embodiments of the present invention are at least as follows:

[0015] 1. According to the forklift of the present invention, the front position of the travel wheels of the left and right supports are respectively provided with outriggers that can move up and down, so that the two outriggers can be supported on the ground or other worktables, which is equivalent to adding two support points at the front position of the forklift, realizing the rearward shift of the forklift's center of gravity and enhancing the stability of the forklift during operation.

[0016] 2. The forklift according to the present invention has a mast driven by gears and racks to move back and forth, which is more efficient and easier to maintain;

[0017] 3. According to the forklift of the present invention, when the forklift travels on a road surface with changing terrain, the two rear swivel wheels under the connecting frame of the underframe can be adaptively adjusted up and down according to the changes in terrain along with the bridge plate, so that the drive wheels can keep in contact with the road surface and avoid the drive wheels being lifted off the ground.

[0018] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and will also become apparent in part to those skilled in the art upon studying the description, or may be learned by practice of the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures specifically pointed out in the description and drawings.

[0019] Those skilled in the art will understand that the objectives and advantages achievable with the present invention are not limited to those specifically described above, and that the above and other objectives achievable with the present invention will become clearer from the following detailed description. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, are not intended to limit the scope of the invention. The components in the drawings are not drawn to scale but are merely illustrative of the principles of the invention. For ease of illustration and description of certain parts of the invention, corresponding portions in the drawings may be enlarged, i.e., may appear larger relative to other components in an exemplary device actually manufactured according to the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the installation of push-pull blocks and gears on the mast in a forklift according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of a drive mechanism for achieving synchronous rotation of gears in a forklift according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the underframe 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 shown frame structure;

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

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

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

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

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

[0030] Figure 10 This is a schematic diagram showing the connection between a push-pull block, a pin, a push-pull slider, and a guide block in a forklift according to an embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram illustrating another connection between a push-pull rod, a left support leg, and a push-pull block in a forklift according to an embodiment of the present invention, wherein the push-pull rod is located in a first translational position; wherein, Figure 11 (a) is a side view diagram. Figure 11 (b) is Figure 11 (a) is a partial sectional view shown by line BB.

[0032] Figure 12 This is a schematic diagram illustrating another connection between a push-pull rod, a left support leg, and a push-pull block in a forklift according to an embodiment of the present invention. In this case, the push-pull rod is in a second translational position, but the pin has not yet retracted from the slot; wherein, Figure 12 (a) is a side view diagram. Figure 12 (b) is Figure 12 The cross-sectional view (partial) shown by the CC line in (a);

[0033] Figure 13 This is a schematic diagram illustrating another connection between a push-pull rod, a left support leg, and a push-pull block in a forklift according to an embodiment of the present invention. In this case, the push-pull rod is in a second translational position, and the push-pull block has disengaged from the pin and continues to move forward; wherein... Figure 13 (a) is a side view diagram. Figure 13 (b) is Figure 13 (a) shows a partial sectional view along line DD; and

[0034] Figure 14 for Figure 13 A magnified view of part E in the diagram; and

[0035] Figure 15 This is a schematic diagram showing the connection between the bridge plate, the rear caster wheel, and the intermediate connecting mechanism in a forklift according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 111. Left bracket; 112. Right bracket; 113. Connecting frame; 114. Rack; 115. Mast; 116. Gear; 117. Drive wheel; 118. Front caster wheel;

[0038] 120. Push-pull block; 121. Slot;

[0039] 131. Left outrigger; 132. Right outrigger; 133. Outrigger body; 134. Lifting rod; 135. Compression spring; 136. Contact part; 137. Mounting base; 138. Positioning crossbar;

[0040] 140. Push-pull rod;

[0041] 150. Support 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 protrusion; 173. Through hole; 174. First boss; 175. Second boss;

[0044] 180. Pin; 181. Tension spring; 182. Protrusion;

[0045] 190. Guide block; 191. Guide groove; 192. Receiving groove; 193. Transition groove;

[0046] 210. Cable tray plate; 211. Rear caster wheel; 212. Connecting plate; 213. Vertical plate; 214. Spindle;

[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 Implementation

[0051] The objects and functions of the present invention, as well as the methods for achieving these objects and functions, will be clarified by referring to exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The purpose of this specification is merely to help those skilled in the art to comprehensively understand the specific details of the invention.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0053] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0054] It should be noted that the terms “up,” “down,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used in this article are for illustrative purposes only and are not intended to be limiting.

[0055] First, when operating a reach truck, the side of the mast closest to the object to be transported is considered the front, and the side relatively far from the object is considered the rear. At the same time, when facing forward, the left side is considered the left, and the right side is considered the right.

[0056] This invention provides a mast reach truck. In a preferred embodiment, such as... Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, where Figure 1 This is a schematic diagram of the installation of the push-pull block 120 and gear 116 on the mast 115 in a forklift according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the underframe 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 shown frame structure; Figure 5 This is a schematic diagram showing the connection between the push-pull rod 140, the left outrigger 131, and the push-pull block 120 in a forklift according to an embodiment of the present invention. The reach truck according to an embodiment of the present invention may include a chassis, a mast 115, a left outrigger 131, a right outrigger 132, a push-pull block 120, and a push-pull rod 140.

[0057] The base frame and mast 115 serve as the basic structure of the forklift, used to mount or support the left outrigger 131, right outrigger 132, push-pull block 120, and push-pull rod 140. The push-pull block 120, a crucial component of this application, drives the push-pull rod 140 to move back and forth. When the push-pull rod 140 is connected to the push-pull block 120, it can contact and apply downward pressure to the left outrigger 131 and right outrigger 132 under the pushing and pulling action of the push-pull block 120. The left outrigger 131 and right outrigger 132 can move downwards under the action of this downward pressure, and simultaneously spring back to their original positions when the downward pressure is removed.

[0058] Specifically, please refer to Figure 1 , Figure 3 and Figure 4 The reach truck in this embodiment may include a left support 111, a right support 112, and a mast 115 disposed between the left support 111 and the right support 112. The left support 111 and the right support 112 are arranged horizontally and parallel to each other. Generally, drive wheels 117 are respectively disposed at the middle position of the left support 111 and the right support 112. The mast 115 is movable back and forth relative to the left support 111 and the right support 112 in the front-back direction.

[0059] Regarding the forward and backward movement of gantry 115 relative to left support 111 and right support 112 in the forward and backward direction, see [link / reference]. Figure 1 and Figure 3 The left support 111 and the right support 112 can each be provided with racks 114 along the front-to-back direction on their respective inner sides. The gantry 115 has gears 116 on its left and right sides, located below the push-pull block 120. The two gears 116 on both sides of the gantry 115 mesh with the corresponding racks 114 and can rotate synchronously. When the two gears 116 rotate synchronously, the gantry 115 moves back and forth due to the meshing of the gears 116 with the racks 114.

[0060] Regarding how the two gears 116 achieve synchronous rotation, the specific implementation method is not limited. For example, refer to... Figure 2 The drive mechanism for achieving synchronous rotation of the two gears 116 may include a motor EM for providing driving force, located at the bottom of the gantry 115, and a rotatable rotating rod RG arranged in the left-right direction. Both ends of the rotating rod RG extend to the outside of the gantry 115. Gears 116 are respectively arranged on both sides of the rotating rod RG outside the gantry 115. The motor EM is powered by the rotating rod RG to rotate it, thereby driving the gears 116 at both ends to rotate synchronously.

[0061] In this embodiment, the two push-pull blocks 120 of the forklift are respectively located on the left and right sides of the mast 115. The two push-pull blocks 120 can move back and forth synchronously with the mast 115.

[0062] refer to Figure 4The forklift in this embodiment includes two outriggers, namely a left outrigger 131 and a right outrigger 132. The left outrigger 131 and right outrigger 132 are respectively positioned in front of the left support 111 and right support 112, respectively, near their respective drive wheels 117. Front casters 118 can also be provided on the left support 111 and right support 112 between their respective drive wheels 117 and the corresponding left outrigger 131 and right outrigger 132 to facilitate forklift movement. The left outrigger 131 and right outrigger 132 can move vertically between a first vertical position H1 and a second vertical position H2 relative to the left support 111 and right support 112, respectively. For example, when subjected to downward pressure, the left outrigger 131 and right outrigger 132 can move downward to the second vertical position H2 relative to the left support 111 and right support 112, respectively, and can spring back to the first vertical position H1 when the downward pressure is removed. When the left support leg 131 and the right support leg 132 move downward to the second vertical position H2, their bottoms can be flush with the bottom of the drive wheel 117.

[0063] refer to Figure 4 and Figure 5 The forklift of this embodiment includes two push-pull rods 140 movably connected to push-pull blocks 120 on corresponding sides between a first translation position W1 and a second translation position W2. The two push-pull rods 140 are respectively disposed inside the left support 111 and the right support 112 and arranged in the front-rear direction. The push-pull rods 140 can move synchronously back and forth relative to the left support 111 and the right support 112 under the push and pull of the back-and-forth moving push-pull blocks 120, so that their front ends press down or disengage from the corresponding left support leg 131 and right support leg 132, thereby applying or removing downward pressure to the left support leg 131 and right support leg 132.

[0064] The push-pull block 120 and the push-pull rod 140 are connected in a movable manner, 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 disengaged, so that the push-pull block 120 can continue to move forward with the gantry 115.

[0065] Specifically, refer to Figure 5 , Figure 8 , Figure 9 and Figure 10 To achieve a movable connection between the push-pull block 120 and the push-pull rod 140, a vertical slot 121 can be provided on the outer side of the push-pull block 120. A push-pull slider 170 can 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 (left-right direction) pin 180 that can be engaged in the slot 121.

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

[0067] refer to Figure 9 , Figure 10 and Figure 14 Furthermore, the pin 180 is a retractable pin in the left-right direction. The slider body 171 has a through hole 173 through which the pin 180 passes. The portion of the pin 180 within the through hole 173 is fitted with a first elastic element for driving the pin 180 to move toward the receiving groove 192.

[0068] Regarding the first elastic element, it can be either a compression spring or a tension spring. For example, when the first elastic element is a tension spring 181, the top end of the tension spring 181 is connected to a pin 180, for example, the pin 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 used to accommodate the tension spring 181 has a relatively larger diameter.

[0069] When the pin 180 moves forward with the push-pull slider 170 to the second translation position W2, the pin 180 can be inserted into the receiving groove 192 under the elastic force of the push-pull spring, and the other end of the pin 180 is withdrawn from the slot 121, so that the push-pull block 120 is disengaged from the push-pull rod 140 (push-pull slider 170).

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

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

[0072] refer to Figure 13The push-pull rod 140, which has moved to the second translational position W2, can be disconnected from the push-pull block 120 so that the push-pull block 120 can continue to move forward, and the front end of the push-pull rod 140 can keep pressing down the left support leg 131 and the right support leg 132 so that the left support leg 131 and the right support leg 132 can remain in the second vertical position H2.

[0073] According to the forklift of the present invention, a left support leg 131 and a right support leg 132 are respectively provided in front of the drive wheels 117 of the left support 111 and the right support 112. The left support leg 131 and the right support leg 132 can move up and down under the combined 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 forward to the second translation position W2, the left support leg 131 and the right support leg 132 can move down 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 workbench, which is equivalent to adding a support point in front of the forklift, realizing the rearward shift of the forklift's center of gravity, enhancing the stability of the forklift during operation, and the push-pull rod 140 and the push-pull block 120 can be disconnected when the forklift moves to the second translation position W2, so that the push-pull block 120 can continue to move forward, that is, it does not affect the mast 115 to continue to move forward for operation. In addition, compared with the existing hydraulic transmission method, the gantry 115 adopts a gear 116 and rack 114 drive method, which is easier to maintain and has higher transmission efficiency.

[0074] refer to Figure 10 To ensure greater stability when the push-pull slider 170 moves back and forth under the push-pull block 120, the guide block 190 can be a U-shaped guide block 190 with an inward opening. This opening is used to accommodate the pin 180, allowing it to engage with the corresponding slot 121 of the push-pull block 120. The U-shaped groove space enclosed within the guide block 190 forms a guide groove 191 that adapts to the slider body 171, thereby enabling directional movement of the slider body 171 (push-pull slider 170). A receiving groove 192 is provided on the bottom surface of the guide groove 191 of the guide block 190.

[0075] refer to Figure 9 To ensure greater stability during the directional movement of the slider body 171 (push-pull slider 170), the slider body 171 may also have a vertically protruding first protrusion 172. Naturally, the guide groove 191 is also provided with a space to accommodate the first protrusion 172. The first protrusion 172 can be arranged protruding vertically on both the upper and lower sides, and its height is greater than that of the slider body 171, extending a certain length in the front-back direction.

[0076] The structure of the push-pull rod 140, which allows the front end to be pressed down or disengaged from the corresponding left support leg 131 and right support leg 132, can be left unrestricted.

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

[0078] The portion of the lifting rod 134 located within the cavity is fitted with a second elastic element, which drives the outrigger body 133 to spring upward to the first vertical position H1 when the downward pressure is removed.

[0079] Regarding the second elastic element, it can be either a compression spring or a tension spring. For example, when the second elastic element is a compression spring 135, the top end of the compression spring 135 can abut against the support leg body 133. The bottom end of the compression spring 135 can be connected to the lifting rod 134. The connection between the bottom end of the compression spring 135 and the lifting rod 134 can be either fixed or movable (e.g., abutting).

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

[0081] Each support leg slider 150 is located at the front end of the corresponding push-pull rod 140. The bottom of the support leg slider 150 has a wedge-shaped surface 151 that gradually moves downwards from front to back. A contact portion 136 can be located on the top of the support leg body 133. When the push-pull rod 140 moves forward until it reaches the second translational position W2, the push-pull rod 140 simultaneously drives the wedge-shaped surface 151 of the support leg slider 150 to gradually approach and contact the contact portion 136. Then, the wedge-shaped surface 151 presses down on the contact portion 136, and the contact portion 136 presses down on the left support leg 131 and the right support leg 132, ultimately causing the left support leg 131 and the right support leg 132 to move downwards to the second vertical position H2. When the push-pull rod 140 moves backward, it simultaneously drives the wedge-shaped surface 151 of the support leg slider 150 to move away from the contact part 136, so that the wedge-shaped surface 151 does not contact the contact part 136, thereby causing the left support leg 131 and the right support leg 132 to return to the first vertical position H1 under the rebound force of the compression spring 135.

[0082] Continue referring to Figure 5. Figure 6 and Figure 7To ensure greater stability when the outrigger slider 150 moves forward and backward and when pressing down on the left outrigger 131 and right outrigger 132, the forklift in this embodiment may further include a second guide mechanism for directional movement of the outrigger 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 disposed on the leg slider 150 and protrude horizontally to the left and right sides. For example, the second protrusion 152 can be disposed 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 back direction.

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

[0085] When the push-pull block 120 drives the push-pull rod 140 forward to the second translation position W2, and the push-pull block 120 disengages from the pin 180, in order to further ensure that the push-pull rod 140 stops moving, the forklift of this application may also include a second positioning mechanism for stopping the push-pull rod 140 from moving.

[0086] Specifically, refer to Figure 5 , Figure 6 and Figure 7 The second positioning mechanism may include an overhead positioning crossbar 138 arranged in the left-right direction and disposed on the contact portion 136. The positioning crossbar 138 is horizontally mounted on the mounting base 137 of the contact portion 136. The bottom of the support leg slider 150 may also be provided with a positioning groove 153 that matches the positioning crossbar 138 and engages with the wedge-shaped surface 151. When the push-pull block 120 drives the push-pull rod 140 to move forward to the second translational position W2, the positioning crossbar 138 is precisely engaged in the positioning groove 153.

[0087] Further, refer to Figure 9 and Figure 11To better synchronize the movement of the push-pull block 120 and the push-pull rod 140, the push-pull slider 170 may further include a first boss 174 protruding towards the push-pull block 120 on the inner side of the slider body 171, and a second boss 175 located at the rear end of the first boss 174. The second boss 175 protrudes towards the push-pull block 140 relative to the first boss 174. A through hole 173 may be provided in the first boss 174. The connection between the first boss 174 and the slider body 171 in the front-rear direction may be an arc surface, so that when the push-pull block 120 moves backward, it can more easily move onto the first boss 174 via the arc surface and abut against the second boss 175. When the push-pull rod 140 is at the second translation position W2, the push-pull block 120 moves from front to back until it abuts against the second boss 175. By pushing the second boss 175, the entire push-pull slider 170 can be moved backward. 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 pin 180. This allows the pin 180 to be precisely engaged in the slot 121 when the push-pull block 120 moves the push-pull slider 170 backward. The second boss 175 also serves as a positioning function.

[0088] refer to Figure 3 To optimize the positioning of the push-pull slider 170 and facilitate better connection and disengagement with the push-pull block 120, the left bracket 111 and right bracket 112 can also have elongated square holes SH along the front-rear direction on their respective inner surfaces, providing space for the push-pull slider 170 to move back and forth. The first protrusion 174 and the second protrusion 175 of the push-pull slider 170 can extend from the square holes SH. Thus, when the push-pull slider 170 moves back and forth, the first protrusion 174 and the second protrusion 175 are also restricted in the front-rear direction by the square holes SH, effectively acting as a limiting mechanism. For example, when the push-pull rod 140 moves forward to the second translational position W2, the first protrusion 174 abuts against the leading edge of the square hole SH. When the push-pull rod 140 moves backward to the first translational position W1, the second protrusion 175 abuts against the rear edge of the square hole SH.

[0089] refer to Figure 14 In order to make it easier for the pin 180 to exit the receiving groove 192 when the push-pull block 120 moves backward and abuts against the second boss 175, the front and rear sides of the receiving groove 192 can be provided with transition grooves 193 for smooth transition.

[0090] As mentioned above, a push-pull block 120 is provided on each of the left and right sides of the gantry 115. It can be understood that the installation positions of the two push-pull blocks 120 on the gantry 115 are generally symmetrical. The installation positions of other components such as the push-pull rod 140, push-pull slider 170, support leg slider 150, and support legs are also symmetrical, and their dimensions and lengths are generally the same. However, the opening directions of the slots 121 on the two push-pull blocks 120 are opposite. The push-pull block 120 can be an axisymmetric mechanism with a larger upper section and a smaller lower section. To ensure that the pins 180 on each side can be accurately engaged with the push-pull block 120, at least two vertical slots 121 are provided at intervals on the outer 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 slots 121 are arranged symmetrically about the vertical center line of the push-pull block 120. This serves as a foolproof design, ensuring that the push-pull block 120 on either side can be swapped to the opposite side and still function normally. It also provides multiple slots 121 for use during installation, ensuring that the pin 180 can be inserted into one of the slots 121 as much as possible, and provides a replacement slot 121 if a slot 121 is damaged.

[0091] Additionally, refer to Figure 3 and Figure 4 A connecting frame 113 is also provided between the rear ends of the left support 111 and the right support 112. A cable tray 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 caster wheel 211 is installed at each end of the cable tray plate 210.

[0092] Further, refer to Figure 15 The forklift of this application may further include an intermediate connecting mechanism pivotally connected to the bridge plate 210 via a horizontal pivot 214, so as to realize that one side of the bridge plate 210 is lowered and the other side is raised. The intermediate connecting mechanism may include a horizontal connecting plate 212 fixedly connected to the connecting frame 113. Vertical plates 213 are respectively provided at the front and rear of the connecting plate 212, and the pivot 214 rotatably passes through the two vertical plates 213 and the bridge plate 210.

[0093] The connecting plate 212 and the cable tray plate 210 are spaced a certain distance apart in the vertical direction so that the cable tray plate 210 does not interfere with the connecting plate 212 when it swings up and down.

[0094] Currently, the drive wheels 117 and driven wheels mounted on the chassis of reach trucks are mostly at a fixed height, which cannot adaptively change their vertical position according to terrain changes. This can cause the drive wheels 117 to be lifted off the ground, thus preventing normal movement. The forklift of this application is equipped with two vertically movable rear casters 211 via the bridge plate 210. When the forklift travels on roads with changing terrain, the two rear casters 211 can adaptively adjust their vertical position according to the terrain changes via the bridge plate 210, so that the drive wheels 117 can keep in contact with the road surface and avoid being lifted off the ground.

[0095] Other embodiments of the invention will be readily conceived and understood by those skilled in the art in conjunction with the description and practice of the invention disclosed herein. The descriptions and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are defined by the claims.

Claims

1. A mast reach truck, characterized in that, The forklift includes; The base frame includes a left support, a right support, and a connecting frame whose two ends are respectively connected to the left support and the right support; the left support and the right support are respectively provided with racks along the front-rear direction on their opposite inner surfaces; A gantry is disposed between the left and right supports and is movable relative to the left and right supports in the front-back direction; the gantry is provided with push-pull blocks and gears located below the push-pull blocks on the left and right sides respectively, and the two gears on both sides of the gantry can rotate synchronously and mesh with the racks on the corresponding sides; The left and right support legs are respectively located in front of the respective drive wheels of the left and right supports, and the left and right support legs are configured to move up and down relative to the left and right supports between a first vertical position and a second vertical position. as well as Push-pull rods are respectively disposed inside the left and right supports along the front-back direction. The push-pull rods are configured to be movably connected to the push-pull blocks between a first translational position and a second translational position relative to the left and right supports, and move synchronously back and forth under the push-pull force applied by the push-pull blocks in the front-back movement. Also includes: A vertical slot is provided on the outer side of the push-pull block; A push-pull slider is provided at the rear end of the push-pull rod. The push-pull slider includes a slider body, and the slider body is provided with a horizontal pin in the left-right direction that can be locked into the slot. The push-pull slider further includes a first protrusion protruding towards the push-pull block on the inner side of the slider body and a second protrusion located at the rear end of the first protrusion. The connection between the first protrusion and the slider body in the front-rear direction is constructed as an arc surface. When the pin is engaged in the slot, the second protrusion abuts against the push-pull block from back to front; It also includes a first guide mechanism for directional movement of the push-pull slider and a first positioning mechanism for stopping the push-pull rod from moving; The first guiding mechanism includes: A U-shaped guide block with an inward opening, the guide block having a guide groove adapted to the slider body; The first positioning mechanism includes: A receiving groove is provided on the bottom surface of the guide groove of the guide block; The pin is constructed to be retractable in the left-right direction, and the push-pull slider has a through hole through which the pin passes; a first elastic element is sleeved on the portion of the pin inside the through hole for driving the pin to move toward the receiving groove; When the pin, which is embedded in the slot, moves forward with the push-pull block to the second translational position, the pin is inserted into the receiving groove under the elastic force of the first elastic element, thereby withdrawing from the slot. In this configuration, the front end of the push-pull rod located at the first translational position does not contact the left and right support legs, so that the left and right support legs are in the first vertical position. When the push-pull block pushes the push-pull rod forward to the second translational position, the front end of the push-pull rod applies downward pressure to the left and right support legs, so that the left and right support legs move downward to the second vertical position. The push-pull rod that has moved to the second translational position can disconnect from the push-pull block, so that the push-pull block can continue to move forward, and the front end of the push-pull rod keeps pressing down on the left and right support legs, so that the left and right support legs remain in the second vertical position.

2. The forklift according to claim 1, characterized in that, The connecting frame is also provided with a bridge plate in the middle position, which can be lowered on one side and raised on the other side in the left-right direction. Each end of the bridge plate is equipped with a rear caster.

3. The forklift according to claim 2, characterized in that, The forklift also includes an intermediate connecting mechanism pivotally connected to the cable tray plate via a horizontal pivot, so as to allow one side of the cable tray plate to be lowered and the other side to be raised. The intermediate connecting mechanism includes: A horizontal connecting plate fixedly connected to the connecting frame; Two vertical plates located at the front and rear of the connecting plate are connected to the connecting plate, and the rotating shaft rotatably passes through the two vertical plates and the cable tray plate; 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, The outer side of the push-pull block is provided with at least two vertical slots at intervals, and the at least two slots are arranged symmetrically about the vertical center line of the push-pull block.

5. The forklift according to claim 1, characterized in that, Both the left and right outriggers include an outrigger body. The outrigger body is provided with a lifting rod that extends vertically from the outside to the inside. The outrigger body is provided with a cavity for accommodating the lifting rod. The portion of the lifting rod located in the cavity is fitted with a second elastic element, which is used to drive the outrigger body to spring back upward to the first vertical position when the downward pressure is removed.

6. The forklift according to claim 5, characterized in that, The forklift also includes a pressing mechanism for pressing down the front end of the push-pull rod, the pressing mechanism comprising: A support leg slider is provided at the front end of the push-pull rod, and the bottom of the support leg slider is provided with a wedge-shaped surface that gradually moves downward from front to back. The contact portion is provided to the support leg body; When the push-pull rod moves forward to the second translational position, the wedge-shaped surface contacts and presses down on the contact portion, so that the left and right support legs move downward to the second vertical position.

7. The forklift according to claim 6, characterized in that, The forklift also includes: A second guide mechanism for directional movement of the outrigger slider, the second guide mechanism comprising: A second protrusion is provided on the horizontally outward protrusion of the support leg slider; Guide plates are respectively disposed above the left and right support legs, and the bottom of the guide plates is provided with guide grooves that match the second protrusion; and / or A second positioning mechanism for stopping the push-pull rod from moving, the second positioning mechanism comprising: A horizontal positioning bar that is suspended in the left-right direction and is installed at the contact part; A positioning groove matching the positioning crossbar is provided at the bottom of the support leg slider and connects with the wedge-shaped surface.

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