Height adjusting mechanism and method for pallet fork rotating arm

Abstract

The height adjusting mechanism comprises an adjusting column connected with the pallet fork rotating arm, the adjusting column is connected to the middle of a slotted thick plate in a threaded mode, the slotted thick plate comprises a thick plate body, and the two ends of the thick plate body are connected with a vehicle body fixing plate through connecting pieces respectively; an adjusting groove is horizontally formed in one end of the thick plate body, the outer end of a groove opening of the adjusting groove is located at the outer end of the thick plate body, and the inner end of the groove opening communicates with the adjusting column; the adjusting column is rotated to drive the pallet fork rotating arm to ascend and descend, and the adjusting column is locked or loosened by adjusting the opening size of the inner end of the notch through the connecting piece. The invention further discloses an adjusting method of the height adjusting mechanism and a forklift comprising the height adjusting mechanism. The adjusting column is in threaded connection with the slotted thick plate, the fastening screw is in threaded connection with the notch lower plate in the slotted thick plate, ascending and descending of the adjusting column are achieved, and therefore the purpose of adjusting the height of the pallet fork rotating arm is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of forklifts, in particular to a height adjusting mechanism and adjusting method of a fork rotating arm. BACKGROUND

[0002] At present, the installation of a pallet truck is combined with a frame and a lifting system, that is, the hydraulic cylinder, hydraulic pipeline, oil valve and driving motor in the lifting system are fixed on the frame through a mounting plate to ensure the rational use of space and improve the driving field of vision. The fork is connected with a fork rotating arm, and the top end of the fork rotating arm always abuts against a fixed thick plate installed on the frame fixing plate.

[0003] Due to the existence of machining errors and welding errors, the height of the two fork rotating arms on both sides of the frame needs to be adjusted during assembly, so as to change the landing height of the fork and make the two forks at the same level, so as to reach the design value. The adjusting method is shown in Figure 11 The top end of the fork rotating arm 6 always abuts against the fixed thick plate 8, and the fixed thick plate 8 needs to be moved up and down during adjustment, that is, different numbers and thicknesses of shims 7 are inserted between the frame fixing plate 3 and the fixed thick plate 8, so that the fixed thick plate 8 is lowered or raised, and then the fixed thick plate 8 is connected with the frame fixing plate 3 through the fastening bolt 4, so as to adjust the height of the fork rotating arm 6. However, this adjusting method needs to lift the whole truck and operate at the bottom of the truck, which is inconvenient and dangerous, and time-consuming and laborious. SUMMARY

[0004] Based on the above technical problems, the present application provides a height adjusting mechanism and adjusting method of a fork rotating arm, and a forklift comprising the height adjusting mechanism, to adjust the height of the fork rotating arm.

[0005] The specific technical scheme of the present application is as follows: A height adjusting mechanism of a fork rotating arm, comprising an adjusting column connected with the fork rotating arm, the adjusting column being threadedly connected in the middle of a slotted thick plate, the slotted thick plate comprising a thick plate body, the two ends of the thick plate body being connected with a frame fixing plate through connecting pieces; a adjusting slot is horizontally formed at one end of the thick plate body, the slot opening outer end of the adjusting slot being located at the outer end of the thick plate body, and the slot opening inner end being in communication with the adjusting column; the adjusting column is rotated, and the opening size of the slot opening outer end is adjusted through the connecting piece until the slot opening inner end locks the adjusting column.

[0006] In a further aspect, the adjusting column comprises a fixedly connected threaded segment and a connecting segment, the top end of the threaded segment being connected with a rotating piece to drive the adjusting column to rotate and make the fork rotating arm perform lifting movement; the bottom end of the connecting segment abutting against the top end of the fork rotating arm.

[0007] Further, the rotating member comprises an inner hexagonal hole formed in the top end face of the threaded segment, and an inner hexagonal wrench matched with the inner hexagonal hole.

[0008] Further, the middle of the thick plate body is provided with an inner threaded hole threadedly connected with the adjusting column, and the two ends of the thick plate body are respectively provided with a first connecting hole and a second connecting hole; the first connecting hole penetrates the upper slot plate and the lower slot plate respectively, the first connecting hole in the upper slot plate is a through hole, the first connecting hole in the lower slot plate is a threaded hole, and the diameter of the through hole is larger than that of the first threaded hole; the second connecting hole is a threaded hole.

[0009] Further, the opening size of the adjusting groove at the outer end of the slot is adjusted by the connecting member, so that the opening of the adjusting groove gradually decreases from the fixed end of the slot to the outer end of the slot, and the outer end of the slot is closed.

[0010] The opening size S0 of the adjusting groove is greater than or equal to the pitch T of the outer thread of the adjusting column, so that when the connecting member is locked, the opening at the inner end of the slot can clamp and lock the adjusting column, and the adjusting column will not rotate under the action of external force.

[0011] The second object of the present application is to provide an adjusting method of the height adjusting mechanism, which comprises the following steps: A1, the slotted thick plate is placed on the lower end face of the vehicle body fixed plate, the threaded segment of the adjusting column is threadedly screwed into the inner threaded hole of the slotted thick plate, and the top end of the threaded segment is movably arranged in the vehicle body fixed plate; and the connecting segment of the adjusting column is located at the bottom of the slotted thick plate; A2, the fastening screws are threadedly screwed into the vehicle body fixed plate and the slotted thick plate in sequence, wherein the fastening screw connected with the first connecting hole of the slotted thick plate is not screwed tightly, and the fastening screw connected with the second connecting hole is screwed tightly; at this time, the distance between the bottom end face of the adjusting column and the bottom end face of the slotted thick plate is L0, and the opening size of the adjusting groove in the slotted thick plate is S0; A3, the adjusting column is rotated to move downward, that is, the fork rotating arm moves downward to the required height; at this time, the distance between the bottom end face of the adjusting column and the bottom end face of the slotted thick plate is L1; A4, the fastening screw connected with the first connecting hole is screwed tightly, the threaded screwing of the fastening screw and the lower slot plate causes the plastic deformation of the lower slot plate and the upward movement of the lower slot plate, so that the opening of the adjusting groove gradually decreases from the fixed end of the slot to the outer end of the slot, and the outer end of the slot is closed; A5, the opening at the inner end of the slot is clamped on the threaded groove of the adjusting column to be locked; thereby the position of the fork rotating arm is adjusted; A6, loosen the fastening screw connected with the first connecting hole, the slot lower plate restores to the original state, continue to rotate the adjusting column to make it continue to move down until the limit position, at this time the distance between the bottom end surface of the adjusting column and the bottom end surface of the slotted thick plate is L2, then the height of the adjusting column with the fork rotating arm can be adjusted is L2-L0.

[0012] Further scheme, S0 in step A2 is greater than or equal to the pitch T.

[0013] The third object of the present application is to provide a forklift truck comprising the height adjusting mechanism described above.

[0014] The present application has the following beneficial effects: The height adjusting mechanism of the present application adopts the threaded connection of the adjusting column and the slotted thick plate, and the threaded connection of the fastening screw and the slot lower plate in the slotted thick plate, and the rotation of the two structures is realized by rotating the adjusting column and the fastening screw, so that the adjusting column is raised and lowered, thereby achieving the height adjustment of the fork rotating arm during assembly.

[0015] The height adjusting mechanism of the present application can move up and down by rotating the adjusting column, and then lock the adjusting column by tightening the fastening screw at the outer end of the slot, the distance of the downward movement of the adjusting column can be suspended at any distance in 0 to (L2-L0) and locked, thereby realizing infinite adjustment. Therefore, the height adjusting mechanism of the present application is very convenient to use in the actual scene of pallet truck assembly.

[0016] The slot lower plate in the slotted thick plate in the height adjusting mechanism of the present application will be plastically deformed during the locking process of the fastening screw, so that the slot lower plate at the outer end of the slot is lifted to reduce the opening size of the outer end of the slot, that is, it gradually decreases from the fixed end of the slot-the inner end of the slot-the outer end of the slot, until the outer end of the slot is closed, and the opening of the inner end of the slot is just clamped on the thread groove of the adjusting column to lock the adjusting column and prevent it from rotating.

[0017] After loosening the fastening screw, the slot lower plate restores to the original state, and the adjusting column can rotate under external force. Therefore, the height adjusting mechanism of the present application can repeatedly lock and loosen the adjusting column by using the fastening screw, thereby maintaining the perfect locking ability of the adjusting column for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a structural schematic diagram of the present application; Figure 2 The figure is a structural schematic diagram of the adjusting column in the present application; Figure 3 The figure is a structural schematic diagram of the slotted thick plate in the present application; Figure 4 The figure is an installation and operation schematic diagram of the present application; Figure 5 For the present invention, a state diagram is used; Figure 6 Schematic diagram of the first state of the adjustment column in the present invention (the adjustment column is at a height L0 and is not locked); Figure 7 Schematic diagram of the second state of the adjustment column in the present invention (the adjustment column is at a height L1 and is not locked); Figure 8 Schematic diagram of the third state of the adjustment column in the present invention (the adjustment column is at a height L1 and locked); Figure 9 Schematic diagram of the fourth state of the adjustment column in the present invention (the adjustment column is at a height L2 and is not locked); Figure 10 for Figure 8 Enlarged view of part A in the middle; Figure 11 It is a structural diagram of an existing regulating mechanism.

[0019] In the picture: 1 adjusting column, 11 threaded section, 12 connecting section, 13 hexagonal socket; 2 slotted thick plate, 21 first connecting hole, 22 second connecting hole, 23 internal threaded hole, 24 adjusting slot, 241 outer end of adjusting slot, 242 inner end of adjusting slot, 25 upper plate of adjusting slot, 26 lower plate of adjusting slot; 3 Body fixing plate; 4 Fastening screws; 5 Hexagon wrench; 6. Fork arm; 7. Pad; 8. Fixed thick plate. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] like Figure 11 As shown, in the existing adjustment mechanism structure of the fork arm, the top end of the fork arm 6 is always in contact with the bottom end of the fixed thick plate 8. When adjusting the installation height of the fork, the fixed thick plate 8 needs to be moved up and down to adjust, that is, pads 7 of different numbers and thicknesses are inserted between the vehicle body fixed plate 3 and the fixed thick plate 8, so that the fixed thick plate 8 can be lowered or raised, and then the fixed thick plate 8 is connected to the vehicle body fixed plate 3 by tightening the bolts 4, so as to adjust the height of the fork arm 6.

[0022] Example 1: refer to Figures 1-10The height adjusting mechanism of the fork rotating arm provided by the embodiment comprises an adjusting column 1 connected with the fork rotating arm 6, the adjusting column 1 is shown in Figure 2 , which comprises a fixedly connected threaded segment 11 and a connecting segment 12, the top end of the threaded segment 11 is connected with a rotating member for driving the adjusting column 1 to rotate and make it perform lifting movement, and the bottom end of the connecting segment 12 abuts against the top end of the fork rotating arm 6.

[0023] The adjusting column 1 is threadedly connected in the middle of a slotted thick plate 2, the slotted thick plate 2 is shown in Figure 3 , which comprises a thick plate body, the two ends of the thick plate body are respectively connected with a vehicle body fixing plate 3 through connecting members, one end of the thick plate body is horizontally provided with an adjusting slot 24, the slot opening outer end 241 of the adjusting slot 24 is located at the outer end of the thick plate body, the slot opening inner end 242 is communicated with the adjusting column 1, and the slot opening fixed end 243 is the connecting part located on both sides of the internal thread hole 23 and connected with the slotted thick plate 2, when the connecting member is locked, the opening size is unchanged, the adjusting column 1 is rotated to make it lift, the opening size of the slot opening outer end 241 is adjusted through the connecting member until it is closed, and the slot opening inner end 242 locks the adjusting column 1.

[0024] In the embodiment, the pitch of the external thread of the adjusting column 1 is T, the opening size S0 of the adjusting slot 24 is greater than or equal to the pitch T of the external thread of the adjusting column 1 in the original state, the slot opening inner end 242 is clamped on the thread groove of the adjusting column 1 to lock the adjusting column 1, and the adjusting column 1 does not rotate even if external force is applied, and when the opening size S1 is less than the pitch T, the adjusting column 1 can rotate under the action of external force (such as an internal hex wrench), that is, it is not locked.

[0025] Specifically, the rotating member comprises an internal hexagonal hole 13 provided in the top end face of the threaded segment 11, and an internal hexagonal wrench 5 matched with the internal hexagonal hole 13 (as shown in Figure 2 , 4 ). In order to facilitate operation, the internal hexagonal wrench 5 is clamped in the internal hexagonal hole 13 in the top end face of the threaded segment 11, the threaded segment 11 is rotated by rotating the internal hexagonal wrench 5, and the connecting segment 12 moves up and down relative to the slotted thick plate 2.

[0026] As shown in Figure 3 , the middle of the thick plate body is provided with an internal thread hole 23 threadedly connected with the adjusting column 1, and the two ends of the thick plate body are respectively provided with a first connecting hole 21 and a second connecting hole 22; the first connecting hole 21 respectively penetrates the slot opening upper plate 25 and the slot opening lower plate 26 located above and below the adjusting slot 24, the first connecting hole located in the slot opening upper plate 25 is a light hole, the first connecting hole located in the slot opening lower plate 26 is a threaded hole, and the diameter of the light hole is greater than the diameter of the first threaded hole; the second connecting hole 22 is a threaded hole.

[0027] Specifically, the opening size of the notch outer end 241 is adjusted by the connecting member, so that the opening of the adjusting groove 24 gradually decreases from the notch fixed end 243 to the notch inner end 242 and then to the notch outer end 241, until the notch outer end 241 is closed.

[0028] In the embodiment, the connecting member is a fastening screw 4. When the fastening screw 4 is tightened, it fixes and connects the vehicle body fixing plate 3 and the slotted thick plate 2. Since one end of the slotted thick plate 2 is provided with the adjusting groove 24 which is in communication with the inner threaded hole 23, when the fastening screw 4 at the notch outer end 241 is tightened, the fastening screw 4 is threadedly connected with the notch lower plate 26 and exerts force on the notch lower plate 26, so that the notch lower plate 26 is deformed and moves upward, thereby gradually decreasing the opening from the notch fixed end 243 to the notch inner end 242 and then to the notch outer end 241, until the notch outer end is closed (as shown in Figure 8 ). The opening of the notch inner end 242 is clamped on the threaded groove of the adjusting column 1 to lock one thread, that is, the adjusting column 1 is locked; that is, the inner hexagonal wrench 5 is rotated by hand, and the adjusting column 1 cannot be rotated.

[0029] Embodiment Two: A method for adjusting the height of a fork rotating arm, comprising the following steps: A1, the slotted thick plate 2 is placed on the lower end surface of the vehicle body fixing plate 3, the threaded segment 11 of the adjusting column 1 is threadedly screwed into the inner threaded hole 23 of the slotted thick plate 2, and the top end is movably arranged in the vehicle body fixing plate 3; and the connecting segment 12 of the adjusting column 1 is located at the bottom of the slotted thick plate 2; The pitch of the threaded segment 11 of the adjusting column 1 is T, and the fork rotating arm 6 always abuts against the connecting segment of the adjusting column 1, as shown in Figure 5 , and the force of the fork rotating arm 6 on the adjusting column 1 is equivalent to F.

[0030] A2, the fastening screw 4 is threadedly screwed into the vehicle body fixing plate 3 and the slotted thick plate 2 in sequence, wherein the fastening screw 4 connecting the first connecting hole 21 of the slotted thick plate 2 is not tightened, and the fastening screw 4 connecting the second connecting hole 22 is tightened; at this time, the distance between the bottom end surface of the adjusting column 1 and the bottom end surface of the slotted thick plate 2 is L0, and the opening size of the adjusting groove 24 in the slotted thick plate 2 is S0, as shown in Figure 6 ; S0 is greater than or equal to the pitch T; A3, the adjusting column 1 is rotated to move downward, that is, the fork rotating arm 6 moves downward together to the desired height; at this time, the distance between the bottom end surface of the adjusting column 1 and the bottom end surface of the slotted thick plate 2 is L1 (as shown in Figure 7 ); A4, tighten the fastening screw connected with the first connecting hole 21, the fastening screw is screwed with the slot lower plate 26 to make the slot lower plate 26 plastically deform and move up, then the opening of the adjusting slot 24 gradually becomes smaller from the slot fixed end 243 to the slot outer end 241, until the slot outer end 241 is closed (such as Figure 8 ); A5, the opening of the slot inner end 242 is clamped on the thread groove of the adjusting column 1 to lock; so as to adjust the position of the fork rotating arm 6; A6, loosen the fastening screw connected with the first connecting hole 21, the slot lower plate 26 returns to its original state, continue to rotate the adjusting column 1 to make it continue to move down until the limit position, at this time the distance between the bottom end face of the adjusting column 1 and the bottom end face of the slotted thick plate 2 is L2, then the adjustable height of the adjusting column 1 with the fork rotating arm 6 is L2-L0 (such as Figure 9 、 10 )。

[0031] Example three: A fork truck, comprising the height adjusting mechanism in example one, for adjusting the height of the fork rotating arm. The specific operation is the same as example two.

[0032] Although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

[0033] Therefore, the above is only the preferred embodiment of the present application, and is not intended to limit the scope of the present application; that is, any equivalent transformation made within the scope of the claims of the present application is within the protection scope of the claims of the present application.

Claims

1. A height adjustment mechanism for a fork arm, characterized by: The invention comprises an adjusting column (1) connected to a fork arm (6), wherein the adjusting column (1) is threadedly connected to the middle of a slotted thick plate (2), wherein the slotted thick plate (2) comprises a thick plate body, and both ends of the thick plate body are connected to a vehicle body fixing plate (3) via connecting pieces; an adjusting groove (24) is horizontally opened at one end of the thick plate body, wherein the outer end (241) of the slot of the adjusting groove (24) is located at the outer end of the thick plate body, and the inner end (242) of the slot is connected to the adjusting column (1); the adjusting column (1) is rotated, and the opening size of the outer end (241) of the slot is adjusted by the connecting piece until it is closed, so that the inner end (242) of the slot locks the adjusting column (1).

2. The height adjustment mechanism according to claim 1, wherein: The adjusting column (1) comprises a fixedly connected threaded section (11) and a connecting section (12); the top end of the threaded section (11) is connected to a rotating member to drive the adjusting column (1) to rotate and thereby perform a lifting movement; the bottom end of the connecting section (12) abuts against the top end of the fork arm (6).

3. The height adjustment mechanism according to claim 2, characterized in that: The rotating member comprises a hexagonal hole (13) provided on the top end surface of the threaded section (11), and a hexagonal wrench (5) matching the hexagonal hole (13).

4. The height adjustment mechanism according to claim 1, wherein: An internal threaded hole (23) threadedly connected to the adjustment column (1) is provided in the middle of the thick plate body, and a first connection hole (21) and a second connection hole (22) are respectively provided at both ends of the thick plate body; the first connection hole (21) respectively passes through the slot upper plate (25) and the slot lower plate (26) located above and below the adjustment slot (24), wherein the first connection hole located in the slot upper plate (25) is a light hole, and the first connection hole located in the slot lower plate (26) is a threaded hole, and the diameter of the light hole is larger than the diameter of the first threaded hole; the second connection hole (22) is a threaded hole.

5. The height adjustment mechanism according to claim 1, characterized in that: The opening size of the slot outer end (241) is adjusted by the connecting piece, so that the opening of the adjustment slot (24) gradually becomes smaller from the slot fixed end (243) toward the slot outer end (241) until the slot outer end (241) is closed.

6. The height adjustment mechanism according to claim 1, wherein: The opening size S0 of the adjustment groove (24) is greater than or equal to the pitch T of the external thread of the adjustment column (1).

7. The method for adjusting a height adjustment mechanism according to any one of claims 1 to 6, wherein: The following steps are involved: A1. Place the slotted thick plate (2) on the lower end surface of the vehicle body fixing plate (3), screw the threaded section (11) of the adjusting column (1) into the internal threaded hole (23) on the slotted thick plate (2), and movably insert the top end of the adjusting column (11) into the vehicle body fixing plate (3); and the connecting section (12) of the adjusting column (1) is located at the bottom of the slotted thick plate (2); A2. Use the fastening screws (4) to screw into the vehicle body fixing plate (3) and the slotted thick plate (2) in sequence, wherein the fastening screw (4) connected to the first connecting hole (21) of the slotted thick plate (2) is not tightened, while the fastening screw (4) connected to the second connecting hole (22) is tightened; then at this time, the distance between the bottom end surface of the adjustment column (1) and the bottom end surface of the slotted thick plate (2) is L0, and the opening size of the adjustment slot (24) in the slotted thick plate (2) is S0; A3. Rotate the adjusting column (1) to move it downward, that is, move it downward with the fork arm (6) to the desired height; at this time, the distance between the bottom end surface of the adjusting column (1) and the bottom end surface of the slotted thick plate (2) is L1; A4. Tighten the fastening screw connected to the first connecting hole (21). The fastening screw and the notch lower plate (26) are screwed together to cause the notch lower plate (26) to undergo plastic deformation and move upward, thereby causing the opening of the adjustment slot (24) to gradually become smaller from the notch fixed end (243) toward the notch outer end (241) until the notch outer end (241) is closed. A5. The opening of the inner end of the notch (242) is locked on the threaded groove of the adjustment column (1); thereby the position of the fork arm (6) can be adjusted; A6. Loosen the fastening screw connected to the first connecting hole (21), and the slotted lower plate (26) returns to its original state. Continue to rotate the adjusting column (1) to move it downward until it reaches the limit position. At this time, the distance between the bottom end surface of the adjusting column (1) and the bottom end surface of the slotted thick plate (2) is L2. The adjustable height of the adjusting column (1) with the fork arm (6) is L2-L0.

8. The adjustment method according to claim 7, characterized in that: In step A2, the opening size S0 of the adjustment groove (24) is greater than or equal to the pitch T.

9. A forklift, characterized in that: The forklift comprises the height adjustment mechanism according to any one of claims 1 to 6.

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