Pallet fork device of small-tonnage forklift

Abstract

The utility model discloses a small-tonnage forklift fork device which comprises an installation assembly, the installation assembly comprises an installation support, and the installation support is connected with a horizontal long shaft. The transverse moving assembly comprises a left-side pallet fork, a right-side pallet fork, a left-side oil cylinder and a right-side oil cylinder; and the hydraulic assembly is respectively communicated with the left oil cylinder and the right oil cylinder. The oil cylinders on the left side and the right side are connected with the pallet forks on the left side and the right side, and then the motion states of the pallet forks can be controlled. The hydraulic assembly is arranged to control the oil cylinders on the left side and the right side to stretch or retract at the same time, so that the distance between the pallet forks on the left side and the right side can be adjusted according to the inserting position distance of a tray. The hydraulic assembly is arranged to control the shortening of the left side oil cylinder and the extension of the right side oil cylinder, so that the left side pallet fork and the right side pallet fork can move leftwards at the same time and can also move rightwards at the same time, the forklift pallet fork device can adapt to different types of pallets and can transversely move cargoes in a narrow space, and the freedom degree of movement of the pallet forks is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a small-tonnage forklift cargo fork device. Background Art

[0002] Forks are the most basic forklift attachments, usually used in pairs to directly carry cargo. The fork is L-shaped, with the horizontal section used to support the cargo and the vertical section connected to the fork frame. Slide the vertical section of the fork into the middle of the fork frame slide of the forklift, making sure the hook or fixing point of the fork is aligned with the corresponding position on the forklift.

[0003] However, the inventors of the present application discovered that when transferring goods, a forklift needs to use a fork for transfer, and the goods are placed on a pallet for easy transfer. However, there are many types of pallets, and the insertion distances of different types of pallets are also different. Usually, a forklift driver often needs to manually adjust the fork according to needs, which is time-consuming and labor-intensive. Secondly, during the process of transferring goods, the fork can only be moved left and right by steering the forklift to move the goods, and it is impossible to move the fork in a small space. Utility Model Content

[0004] In order to solve the problem of insufficient freedom of adjusting the position of forklift forks, the utility model provides a small tonnage forklift fork device, and the specific technical solution is as follows:

[0005] A small-tonnage forklift fork device comprises: a mounting assembly, the mounting assembly comprises a mounting bracket, the mounting bracket is connected to a horizontal long axis; a transverse movement assembly, the transverse movement assembly comprises a left fork and a right fork arranged on the outer peripheral surface of the horizontal long axis and a left cylinder and a right cylinder respectively arranged on opposite surfaces of the mounting bracket; and a hydraulic assembly respectively connected to the left cylinder and the right cylinder, the hydraulic assembly can control the left cylinder to drive the right fork to move along the horizontal long axis, and the hydraulic assembly can control the right cylinder to drive the left fork to move along the horizontal long axis.

[0006] Furthermore, the hydraulic component includes: an actuating oil port, which is connected to an external oil pump; a connecting oil circuit connected to the actuating oil port, which connects the left oil cylinder and the right oil cylinder respectively; and a one-way valve and a one-way hydraulic lock arranged between the actuating oil port and the left oil cylinder and the right oil cylinder, the one-way valve and the one-way hydraulic lock are sequentially connected to the same connecting oil circuit, the connecting oil circuit can control the opening and closing of the one-way hydraulic lock, and the connecting oil circuit can input the hydraulic oil of the actuating oil port into the left oil cylinder and the right oil cylinder respectively through the one-way valve and the one-way hydraulic lock.

[0007] Furthermore, the left oil cylinder includes a left rodless chamber and a left rod chamber, the left rod chamber is connected to the right fork, and the right oil cylinder includes a right rodless chamber and a right rod chamber, the right rod chamber is connected to the left fork; the connecting oil circuit includes a left right shift oil circuit connected to the left rodless chamber, a left left shift oil circuit connected to the left rod chamber, a right right shift oil circuit connected to the right rod chamber, and a right left shift oil circuit connected to the right rodless chamber, and a throttle valve is arranged between the left left shift oil circuit and the right right shift oil circuit; the one-way valve includes a first one-way valve connected to the left right shift oil circuit, a second one-way valve connected to the left left shift oil circuit and the right right shift oil circuit at the same time, and a third one-way valve connected to the right left shift oil circuit; the one-way hydraulic lock includes a first one-way hydraulic lock connected to the first one-way valve in sequence, a second one-way hydraulic lock connected to the second one-way valve in sequence, and a third one-way hydraulic lock connected to the third one-way valve in sequence.

[0008] Furthermore, the action oil port includes: an opening oil port, which is connected to the first one-way valve, the third one-way valve and the second one-way hydraulic lock; a clamping oil port, which is connected to the second one-way valve, the first one-way hydraulic lock and the third one-way hydraulic lock; a right shift oil port, which is simultaneously connected to the left right shift oil circuit and the first one-way valve; and a left shift oil port, which is simultaneously connected to the right left shift oil circuit and the third one-way valve.

[0009] Preferably, the mounting assembly also includes a connecting bracket arranged on a side of the mounting bracket away from the left fork, the connecting bracket is two plates parallel to each other, and bearings are arranged on opposite sides of the connecting bracket, the bearing axis is perpendicular to the connecting bracket, and the connecting bracket and the bearing jointly mount the mounting bracket on the forklift fork frame slide; the transverse movement assembly also includes: a slider arranged on the left fork and the right fork near one end of the horizontal long axis, the slider forms a moving pair with the horizontal long axis; a roller bracket arranged on the left fork and the right fork near the bottom of the mounting bracket, the roller bracket forms a moving pair with the bottom of the mounting bracket; and a cylindrical roller arranged on the roller bracket, the axis of the cylindrical roller is perpendicular to the axis of the horizontal long axis, and the cylindrical roller can roll on one side of the mounting bracket.

[0010] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0011] The utility model connects the left and right oil cylinders to the left and right forks, thereby being able to control the movement state of the forks. Among them, a hydraulic component is set to control the left and right oil cylinders to extend or shorten at the same time, so that the distance between the left and right forks can be adjusted according to the distance of the insertion point of the pallet; a hydraulic component is set to control the left oil cylinder to shorten and the right oil cylinder to extend, so that the left and right forks can move to the left at the same time, and can also move to the right at the same time; under the control of the left and right oil cylinders, the left and right forks can adjust the distance between them and move left and right at the same time, so that the forklift fork device can adapt to different types of pallets and can also move goods horizontally in a small space, increasing the freedom of movement of the forks, improving its scope of application, thereby improving work efficiency and reducing use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 This is a rear view of an embodiment of the utility model;

[0014] Figure 3 This is a diagram of the oil circuit structure of the hydraulic assembly of the utility model.

[0015] In the figure: 1. Mounting assembly; 2. Transverse movement assembly; 4. Hydraulic assembly; 11. Mounting bracket; 12. Connecting bracket; 13. Bearing; 14. Horizontal long axis; 21. Left cylinder; 22. Right cylinder; 23. Left fork; 24. Right fork; 25. Slider; 26. Roller bracket; 27. Cylindrical roller; 28. Ball nut; 29. ​​Universal joint bearing; 41. Action oil port; 42. Connecting oil circuit; 43. One-way valve; 44. One-way hydraulic lock; 45. Throttle valve; 211. Left rodless chamber; 2 12. There is a rod cavity on the left side; 221. There is a rod cavity on the right side; 222. There is no rod cavity on the right side; 411. Open the oil port; 412. Clamp the oil port; 413. Right shift oil port; 414. Left shift oil port; 421. Left right shift oil circuit; 422. Left left shift oil circuit; 423. Right right shift oil circuit; 424. Right left shift oil circuit; 431. First one-way valve; 432. Second one-way valve; 433. Third one-way valve; 441. First one-way hydraulic lock; 442. Second one-way hydraulic lock; 443. Third one-way hydraulic lock. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figure 1 to Figure 2 As shown, an embodiment of the utility model includes: a mounting assembly 1, which includes a mounting bracket 11, which is connected to a horizontal long axis 14, and the mounting bracket 11 is a frame structure, and the horizontal long axis 14 is perpendicular to the two side surfaces of the mounting bracket 11; a transverse movement assembly 2, which includes a left fork 23 and a right fork 24 arranged on the outer peripheral surface of the horizontal long axis 14 and a left cylinder 21 and a right cylinder 22 respectively arranged on the opposite surfaces of the mounting bracket 11; and a hydraulic assembly 4 respectively connected to the left cylinder 21 and the right cylinder 22, the hydraulic assembly 4 can control the left cylinder 21 to drive the right fork 24 to move along the horizontal long axis 14, and the hydraulic assembly 4 can control the right cylinder 22 to drive the left fork 23 to move along the horizontal long axis 14.

[0019] Specifically, the mounting bracket 11 is a frame structure of four plates welded together, and the inner surfaces of the two side plates are connected with a horizontal long axis 14 by screws. The axis of the horizontal long axis 14 is perpendicular to the two side plates, so that the left and right forks moving along the axis of the horizontal long axis 14 can move horizontally, and then the goods placed on the left and right forks can be moved sideways without the help of the forklift steering. The left and right forks are located on the back of the mounting bracket 11.

[0020] Specifically, the bottom of the left cylinder 21 and the right cylinder 22 are fixed on the inner surfaces of the two side plates of the mounting bracket 11 by ball nuts, which are the same as the mounting surface of the horizontal long axis 14, and the movement directions of the telescopic ends of the left and right cylinders are parallel to the axial direction of the horizontal long axis 14. At the same time, the telescopic ends of the left and right cylinders are respectively connected to the right and left forks, and the tops of the right and left forks form a moving pair with the outer peripheral surface of the horizontal long axis 14, so that the right and left forks can slide along the outer peripheral surface of the horizontal long axis 14 under the push of the telescopic ends of the left and right cylinders.

[0021] Specifically, the bottom plate of the mounting bracket 11 is also installed with a hydraulic assembly 4, which is connected to the left and right cylinders respectively, so that the left and right cylinders can push the right and left forks in a certain order under the control of the hydraulic assembly 4, thereby solving the problem that it is difficult for the forklift to adjust the left and right positions of the forks in a narrow space.

[0022] Furthermore, the mounting assembly 1 also includes a connecting bracket 12 arranged on a side of the mounting bracket 11 away from the left fork 23. The connecting bracket 12 is two parallel plates. The opposite sides of the connecting brackets 12 are each provided with a bearing 13. The axis of the bearing 13 is perpendicular to the connecting bracket 12. The connecting bracket 12 and the bearing 13 jointly mount the mounting bracket 11 on the forklift fork frame slide.

[0023] Specifically, the connecting bracket 12 is two parallel long plates, and the connecting bracket 12 is fixedly connected to the front of the mounting bracket 11 by welding or by fixing the reinforcing ribs. Secondly, the two opposite sides of the connecting bracket 12 are respectively connected to two bearings 13 by screw connection, and the axis of the bearing 13 is perpendicular to the side of the connecting bracket 12. Then, the connecting bracket 12 and the bearing 13 are simultaneously placed in the fork frame slideway of the forklift (existing technology, not shown in the figure), wherein the rotating surface of the bearing 13 rolls inside the fork frame slideway, so that the connecting bracket 12 can move up and down in the fork frame slideway with low friction, and then the mounting bracket 11 can move up and down along the fork frame slideway with low friction, thereby reducing the energy loss of the forklift and improving work efficiency.

[0024] Furthermore, the transverse movement assembly 2 also includes: a slider 25 arranged at one end of the left fork 23 and the right fork 24 near the horizontal long axis 14, and the slider 25 forms a moving pair with the horizontal long axis 14; a roller bracket 26 arranged at the left fork 23 and the right fork 24 near the bottom of the mounting bracket 11, and the roller bracket 26 forms a moving pair with the bottom of the mounting bracket 11; and a cylindrical roller 27 arranged on the roller bracket 26, and the axis of the cylindrical roller 27 is perpendicular to the axis of the horizontal long axis 14, and the cylindrical roller 27 can roll on one surface of the mounting bracket 11.

[0025] Specifically, the top of the left and right forks are connected with a slider 25 by welding. The slider 25 is preferably a linear bearing 13. The axis of the slider 25 coincides with the axis of the horizontal long axis 14, which can reduce the friction heat generated when the left and right forks slide along the horizontal long axis 14, thereby improving the stability of the goods when the goods are moved left and right. Secondly, the bottom of the left and right forks are fixedly connected with a roller bracket 26 through a reinforcing rib. Four cylindrical rollers 27 are installed on the top surface of the roller bracket 26. The axis of the cylindrical roller 27 is perpendicular to the top surface of the roller bracket 26, and the cylindrical rollers 27 are respectively located at the two ends of the bottom of the left and right forks, so that when the left and right forks move along the horizontal long axis 14, their bottoms can form rolling friction with the bottom front of the mounting bracket 11, further reducing the friction heat of the left and right forks in the process of moving left and right, and further stabilizing the stability of the goods moving left and right.

[0026] Furthermore, the left cylinder 21 and the right cylinder 22 are connected to the side of the mounting bracket 11 through the ball nut 28, and the left cylinder 21 and the right cylinder 22 are respectively connected to the right fork 24 and the left fork 23 through the universal joint bearing 29, and the left fork 23 and the right fork 24 are both L-shaped forks.

[0027] Specifically, the bottom connection of the left and right oil cylinders is connected by a ball nut 28, which has a spherical head and can be used in conjunction with bolts or screws in multiple directions. This design allows the ball nut 28 to provide greater adjustment room. The telescopic ends of the left and right oil cylinders are connected to the right and left forks through a universal joint bearing 29. The movable connection between the ball nut 28 and the universal joint bearing 29 allows the telescopic direction of the left and right oil cylinders to always be parallel to the horizontal long axis 14 during the process of pushing the right and left forks, thereby ensuring low friction during the sliding process of the right and left forks. In addition, the right and left forks are L-shaped, and the installation method in which the bottom surface is higher than the bottom surface of the mounting bracket 11 allows the right and left forks to not touch the bottom surface when the mounting bracket 11 reaches the lowest point, thereby preventing the right and left forks from colliding with the bottom surface, causing the goods to be impacted, and causing damage or tipping of the goods.

[0028] Furthermore, the hydraulic component 4 includes an actuating oil port 41, which is connected to an external oil pump; a connecting oil circuit 42 connected to the actuating oil port 41, which connects the left oil cylinder 21 and the right oil cylinder 22 respectively; and a one-way valve 43 and a one-way hydraulic lock 44 arranged between the actuating oil port 41 and the left oil cylinder 21 and the right oil cylinder 22, the one-way valve 43 and the one-way hydraulic lock 44 are sequentially connected to the same connecting oil circuit 42, the connecting oil circuit 42 can control the opening and closing of the one-way hydraulic lock 44, and the connecting oil circuit 42 can input the hydraulic oil of the actuating oil port 41 into the left oil cylinder 21 and the right oil cylinder 22 respectively through the one-way valve 43 and the one-way hydraulic lock 44.

[0029] Specifically, the actuating oil port 41 can transport the hydraulic oil delivered by the oil pump (existing technology, not shown in the figure) through the connecting oil circuit 42 to the one-way hydraulic lock 44, and then to the one-way valve 43, wherein the one-way hydraulic lock 44 can enable the one-way valve 43 to transport hydraulic oil in both directions when the connecting oil circuit 42 supplies oil to it, otherwise the one-way valve 43 can only transport the hydraulic oil in one direction from the actuating oil port 41 to the left and right cylinders. The one-way hydraulic lock 44 and the one-way valve 43 are connected in sequence, so that the hydraulic component 4 can form a circulatory oil circuit.

[0030] Furthermore, the left-side oil cylinder 21 includes a left-side rodless chamber 211 and a left-side rod chamber 212, wherein the left-side rod chamber 212 is connected to the right-side fork 24, and the right-side oil cylinder 22 includes a right-side rodless chamber 222 and a right-side rod chamber 221, wherein the right-side rod chamber 221 is connected to the left-side fork 23; the connecting oil circuit 42 includes a left-side right-moving oil circuit 421 connected to the left-side rodless chamber 211, a left-side left-moving oil circuit 422 connected to the left-side rod chamber 212, a right-side right-moving oil circuit 423 connected to the right-side rod chamber 221, and a right-side left-moving oil circuit 424 connected to the right-side rodless chamber 222. The oil circuit 422 and the right side right shift oil circuit 423 bracket are provided with a throttle valve 45; the one-way valve 43 includes a first one-way valve 431 connected to the left side right shift oil circuit 421, a second one-way valve 432 connected to both the left side left shift oil circuit 422 and the right side right shift oil circuit 423, and a third one-way valve 433 connected to the right side left shift oil circuit 424; the one-way hydraulic lock 44 includes a first one-way hydraulic lock 441 connected sequentially to the first one-way valve 431, a second one-way hydraulic lock 442 connected sequentially to the second one-way valve 432, and a third one-way hydraulic lock 443 connected sequentially to the third one-way valve 433.

[0031] Specifically, the left right shift oil circuit 421 is hydraulic oil passing through the first one-way valve 431 into the left rodless chamber 211 of the left cylinder 21, thereby pushing the left rod chamber 212 of the left cylinder 21 to move right, thereby pushing the right fork 24 to move right; the left left shift oil circuit 422 is hydraulic oil passing through the second one-way valve 432 and then passing through the throttle valve 45, wherein the throttle valve 45 of the left left shift oil circuit 422 is opened, and the throttle valve 45 on the right right shift oil circuit 423 is closed, so that the hydraulic oil enters the left rod chamber 212 of the left cylinder 21, thereby pushing the left rodless chamber 211 of the left cylinder 21 to move left, thereby pushing the right fork 24 Move to the left; the right side right shift oil circuit 423 is the hydraulic oil passing through the second one-way valve 432 and then passing through the throttle valve 45, wherein the throttle valve 45 of the left side left shift oil circuit 422 is closed, and the throttle valve 45 on the right side right shift oil circuit 423 is opened, so that the hydraulic oil enters the rod chamber of the right cylinder 22, thereby pushing the right side rod chamber 221 of the right cylinder 22 to move right, and then pushing the left fork 23 to move right; the right side left shift oil circuit 424 is the hydraulic oil passing through the third one-way valve 433 into the right side rodless chamber 222 of the right cylinder 22, thereby pushing the right side rodless chamber 222 of the right cylinder 22 to move left, and then pushing the left fork 23 to move left.

[0032] Furthermore, the actuating oil port 41 includes: an opening oil port 411, which is connected to the first one-way valve 431, the third one-way valve 433 and the second one-way hydraulic lock 442; a clamping oil port 412, which is connected to the second one-way valve 432, the first one-way hydraulic lock 441 and the third one-way hydraulic lock 443; a right shift oil port 413, which is simultaneously connected to the left right shift oil circuit 421 and the first one-way valve 431; and a left shift oil port 414, which is simultaneously connected to the right left shift oil circuit 424 and the third one-way valve 433.

[0033] Specifically, the hydraulic assembly 4 controls the left and right cylinders and then controls the right and left forks to realize four actions: opening, clamping, rightward movement and leftward movement. The flow direction of the hydraulic oil is as follows:

[0034] Opening action: the oil pump delivers the hydraulic oil from the opening oil port 411 to the first one-way valve 431 and the third one-way valve 433, and also to the second one-way hydraulic lock 442, so that the second one-way valve 432 can deliver the hydraulic oil in the opposite direction, wherein the hydraulic oil enters the left right shift oil circuit 421 and the left rodless chamber 211 from the first one-way valve 431 in turn, and then pushes the hydraulic oil in the left rod chamber 212 to pass through the throttle valve 45 and the second one-way valve 432 in turn, and finally flows out from the clamping oil port 412; the hydraulic oil enters the right left shift oil circuit 424 and the right rodless chamber 222 from the third one-way valve 433 in turn, and then pushes the hydraulic oil in the right rod chamber 221 to pass through the throttle valve 45 and the second one-way valve 432 in turn, and finally flows out from the clamping oil port 412. This flow path of the hydraulic oil enables the left and right side forks to be relatively far apart, and thus enables the left and right side forks to be inserted into the pallet with a larger insertion hole distance;

[0035] Clamping action: The oil pump delivers the hydraulic oil from the clamping oil port 412 to the second one-way valve 432, and also to the first one-way hydraulic lock 441 and the third one-way hydraulic lock 443, which enables the first one-way valve 431 and the third one-way valve 433 to pass the hydraulic oil in the reverse direction, wherein the hydraulic oil enters the left shift oil circuit 422 on the left side and the right shift oil circuit 423 on the right side from the second one-way valve 432, and at the same time controls the flow through the throttle valve 45, and then enters the left rod chamber 212 and the right rod chamber 22 respectively. 1, which pushes the hydraulic oil in the left rodless chamber 211 to pass through the left right shift oil path 421 and the first one-way valve 431 in sequence, and then flows out from the open oil port 411; the hydraulic oil pushes the right rod chamber 221, so that the hydraulic oil in the right rodless chamber 222 passes through the right left shift oil path 424 and the third one-way valve 433 in sequence, and then flows out from the open oil port 411. This flow path of the hydraulic oil makes the left and right forks relatively close, so that the left and right forks can be inserted into the pallet with a smaller insertion hole distance;

[0036] Right movement: the oil pump delivers the hydraulic oil from the right shift oil port 413 to the left right shift oil circuit 421 and the left rodless chamber 211 in sequence, the left rodless chamber 211 pushes the hydraulic oil inside the left rod chamber 212 to flow out of the left left shift oil circuit 422, and flows into the right right shift oil circuit 423 and enters the right rod chamber 221, the right rod chamber 221 pushes the hydraulic oil inside the right rodless chamber 222 to flow out of the right left shift oil circuit 424, and finally flows out from the left shift oil port 414, this flow path of the hydraulic oil enables the left and right forks to move to the right at the same time, thereby enabling the forklift to move the goods to the right in a small space;

[0037] Left shift action: the oil pump transports the hydraulic oil from the left shift oil port 414 to the right left shift oil circuit 424 and the right rodless chamber 222 in sequence, the right rodless chamber 222 pushes the hydraulic oil inside the right rod chamber 221 to flow out of the right right shift oil circuit 423, and flows into the left left shift oil circuit 422 and enters the left rod chamber 212, the left rod chamber 212 pushes the hydraulic oil inside the left rodless chamber 211 to flow out of the left right shift oil circuit 421, and finally flows out from the right shift oil port 413. This flow path of the hydraulic oil enables the left and right forks to move to the left at the same time, thereby enabling the forklift to move the goods to the left in a small space.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0039] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A small tonnage forklift fork device, characterized in that: include: A mounting assembly (1), the mounting assembly (1) comprising a mounting bracket (11), the mounting bracket (11) being connected to a horizontal long axis (14); A transverse movement assembly (2), the transverse movement assembly (2) comprising a left fork (23) and a right fork (24) arranged on the outer peripheral surface of the horizontal long axis (14), and a left cylinder (21) and a right cylinder (22) respectively arranged on opposite surfaces of the mounting bracket (11); and A hydraulic assembly (4) is respectively connected to the left cylinder (21) and the right cylinder (22), wherein the hydraulic assembly (4) can control the left cylinder (21) to drive the right fork (24) to move along the horizontal long axis (14), and the hydraulic assembly (4) can control the right cylinder (22) to drive the left fork (23) to move along the horizontal long axis (14).

2. The small tonnage forklift fork device according to claim 1, characterized in that: The hydraulic assembly (4) comprises: An operating oil port (41), the operating oil port (41) is connected to an external oil pump; a connecting oil circuit (42) connected to the actuating oil port (41), the connecting oil circuit (42) being connected to the left oil cylinder (21) and the right oil cylinder (22) respectively; and A one-way valve (43) and a one-way hydraulic lock (44) are arranged between the actuating oil port (41) and the left oil cylinder (21) and the right oil cylinder (22); the one-way valve (43) and the one-way hydraulic lock (44) are sequentially connected to the same connecting oil circuit (42); the connecting oil circuit (42) can control the opening and closing of the one-way hydraulic lock (44); the connecting oil circuit (42) can respectively input the hydraulic oil of the actuating oil port (41) into the left oil cylinder (21) and the right oil cylinder (22) through the one-way valve (43) and the one-way hydraulic lock (44).

3. The small tonnage forklift fork device according to claim 2, characterized in that: The left oil cylinder (21) comprises a left rodless chamber (211) and a left rod chamber (212), the left rod chamber (212) being connected to the right cargo fork (24), and the right oil cylinder (22) comprises a right rodless chamber (222) and a right rod chamber (221), the right rod chamber (221) being connected to the left cargo fork (23); The connecting oil circuit (42) comprises a left right shift oil circuit (421) connected to the left rodless chamber (211), a left left shift oil circuit (422) connected to the left rod chamber (212), a right right shift oil circuit (423) connected to the right rod chamber (221), and a right left shift oil circuit (424) connected to the right rodless chamber (222); a throttle valve (45) is provided between the left left shift oil circuit (422) and the right right shift oil circuit (423); The one-way valve (43) comprises a first one-way valve (431) connected to the left rightward oil circuit (421), a second one-way valve (432) connected to both the left leftward oil circuit (422) and the right rightward oil circuit (423), and a third one-way valve (433) connected to the right leftward oil circuit (424); The one-way hydraulic lock (44) comprises a first one-way hydraulic lock (441) connected in sequence with the first one-way valve (431), a second one-way hydraulic lock (442) connected in sequence with the second one-way valve (432), and a third one-way hydraulic lock (443) connected in sequence with the third one-way valve (433).

4. The small tonnage forklift fork device according to claim 3, characterized in that: The actuating oil port (41) comprises: An open oil port (411), wherein the open oil port (411) is connected to the first one-way valve (431), the third one-way valve (433) and the second one-way hydraulic lock (442); a clamping oil port (412), the clamping oil port (412) being connected to the second one-way valve (432), the first one-way hydraulic lock (441) and the third one-way hydraulic lock (443); A right shift oil port (413), the right shift oil port (413) being connected to the left right shift oil circuit (421) and the first one-way valve (431); A left shift oil port (414), the left shift oil port (414) is connected to the right left shift oil circuit (424) and the third one-way valve (433) at the same time.

5. The small tonnage forklift fork device according to claim 1, characterized in that: The mounting bracket (11) is a frame structure, and the horizontal long axis (14) is perpendicular to two side surfaces of the mounting bracket (11).

6. The small tonnage forklift fork device according to claim 1, characterized in that: The mounting assembly (1) further comprises a connecting bracket (12) arranged on a side of the mounting bracket (11) away from the left fork (23); the connecting bracket (12) is two plates parallel to each other; the opposite sides of the connecting bracket (12) are both provided with bearings (13); the axis of the bearing (13) is perpendicular to the connecting bracket (12); the connecting bracket (12) and the bearing (13) together mount the mounting bracket (11) on a forklift fork frame slideway.

7. The small tonnage forklift fork device according to claim 1, characterized in that: The traverse assembly (2) further comprises: A slider (25) is arranged on one end of the left fork (23) and the right fork (24) close to the horizontal long axis (14), and the slider (25) forms a moving pair with the horizontal long axis (14); a roller bracket (26) disposed on the left fork (23) and the right fork (24) near the bottom of the mounting bracket (11), the roller bracket (26) forming a moving pair with the bottom of the mounting bracket (11); and A cylindrical roller (27) is arranged on the roller bracket (26), wherein the axis of the cylindrical roller (27) is perpendicular to the axis of the horizontal long axis (14), and the cylindrical roller (27) is capable of rolling on one surface of the mounting bracket (11).

8. The small tonnage forklift fork device according to claim 1, characterized in that: The left oil cylinder (21) and the right oil cylinder (22) are both connected to the side of the mounting bracket (11) through a ball nut (28), and the left oil cylinder (21) and the right oil cylinder (22) are both connected to the right fork (24) and the left fork (23) through a universal joint bearing (29).

9. The small tonnage forklift fork device according to claim 1, characterized in that: The left fork (23) and the right fork (24) are both L-shaped forks.

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