Fork clamping device with turnover pallet fork

Abstract

The fork clamping device comprises a forklift connecting frame and a fork assembly, the fork assembly comprises a sliding frame and a fork arm, the sliding frame is connected with the forklift connecting frame in a sliding mode, the fork arm is installed on the sliding frame in a rotating mode, the sliding frame is provided with a driving oil cylinder, and the driving oil cylinder is connected with the fork arm. The two ends of the driving oil cylinder are rotationally connected with the sliding frame and the fork arm respectively, the sliding frame is fixedly connected with a limiting seat, the limiting seat is in threaded connection with a limiting screw, the limiting screw is in threaded connection with a locking nut, the locking nut is connected with the limiting seat in a clamped mode, the limiting screw is fixedly connected with a screw head, and the screw head is connected with the fork arm in a clamped mode. The beneficial effects of the utility model are that in the rotation process of the fork arm, the screw head is connected with the fork arm in a clamping manner, so that the fork arm can be positioned, the rotation angle of the fork arm can be conveniently positioned, and the advantage of convenience in use is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fork clamp devices, in particular to a fork clamp device with a reversible fork. Background Art

[0002] The forklift is equipped with a fork, which drives the fork to move and lifts the goods through the fork, so that the goods can be transported. Because it is not convenient to extend the fork under some goods, the goods need to be clamped to transport them. The forklift is equipped with a hydraulic oil circuit, and a hydraulic oil pump is installed on the hydraulic oil circuit. The hydraulic oil is sent to the hydraulic cylinder through the hydraulic oil circuit to drive the fork to move, providing the fork with a power source to transport the goods.

[0003] The Chinese utility model patent with announcement number CN204938860U discloses a dual-purpose fork clamp for forklifts, wherein the upper guide rail seat and the lower guide rail seat are connected to the left bottom plate assembly and the right bottom plate assembly by bolts, and the oil cylinder is connected to the left bottom plate assembly and the right bottom plate assembly by nuts, etc.; the control valve is connected to the upper guide rail seat by bolts; the protective cover is placed on the upper end of the control valve and connected to the upper guide rail seat; the slider group is built into the upper guide rail seat and the lower guide rail seat; the left clamp assembly and the right clamp assembly are driven by the oil cylinder and slide in the upper guide rail seat and the lower guide rail seat with the built-in slider group; the fork is connected to the left clamp assembly and the right clamp assembly by locking pins, bearing cover, screws, etc.; the fork is provided with multiple locking pin mounting holes and a positioning step hole, which can rotate around the mounting axis and realize 90° rotation through the locking pin control. The dual functions of clamping and picking goods are achieved, avoiding the waste of manpower and time caused by changing fork clamps or clamps for transporting different materials, thereby improving the handling efficiency.

[0004] In the above dual-purpose fork clamp for vehicles, although the angle of the cargo fork can be adjusted, the locking pin needs to be manually inserted into the positioning step hole to position the cargo fork, which is still inconvenient during use. Therefore, the fork clamp decoration in the prior art has the problem of being inconvenient to use. Utility Model Content

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide a fork reversible fork clamp device, which includes a forklift connecting frame and a fork assembly. The fork reversible fork clamp device has the advantage of being easy to use.

[0006] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0007] A fork reversible fork clamp device comprises a forklift connecting frame and a fork assembly, the fork assembly comprises a sliding frame and a fork arm, the sliding frame is slidably connected to the forklift connecting frame, the fork arm is rotatably mounted on the sliding frame, the sliding frame is provided with a driving cylinder, both ends of the driving cylinder are rotatably connected to the sliding frame and the fork arm respectively, the sliding frame is fixedly connected to a limit seat, the limit seat is threadedly connected to a limit screw, the limit screw is threadedly connected to a locking nut, the locking nut is clamped with the limit seat, the limit screw is fixedly connected to a screw head, the screw head is located on one end of the limit screw close to the fork arm, and the screw head is clamped with the fork arm.

[0008] Through such an arrangement, during the rotation of the fork arm, the screw head is clamped with the fork arm, which can play a role in positioning the fork arm and facilitate the positioning of the rotation angle of the fork arm, thereby achieving the advantage of easy use.

[0009] Preferably, two of the limit seats, limit screws and screw heads are provided, the two limit seats, limit screws and screw heads correspond to each other one by one, and the two screw heads are respectively located on both sides of the fork arm.

[0010] Through such an arrangement, the fork arm can be positioned to a state of lifting goods and a state of clamping goods respectively through two screw heads.

[0011] Preferably, the sliding frame is fixedly connected to a connecting seat, the connecting seat is slidably connected to a locking pin, the fork arm is provided with a locking groove cooperating with the locking pin, and the sliding frame is provided with a locking mechanism for driving the locking pin to slide on the connecting seat.

[0012] Such an arrangement can prevent the fork arm from rotating, thereby improving the stability of the fork arm.

[0013] Preferably, the locking mechanism includes a piston tube, a piston block, a piston rod and a sealing plate, the sealing plate closes one end of the piston tube close to the locking pin, the piston block is located in the piston tube and cooperates with the inner wall of the piston tube, the piston rod is fixedly connected to the piston block, the piston rod is passed through the sealing plate, and the end of the piston rod extending out of the piston tube is fixedly connected to the locking pin.

[0014] Through such an arrangement, the function of the locking mechanism driving the locking pin to move is achieved.

[0015] Preferably, an elastic member is provided between the sealing plate and the locking pin.

[0016] Through such an arrangement, the locking pin is kept in a state of being locked in the locking groove.

[0017] Preferably, it further comprises an oil inlet pipe, a main oil return pipe, and a reversing valve, wherein the oil inlet pipe and the main oil return pipe are respectively connected to the reversing valve, and the reversing valve is connected to the driving oil cylinder.

[0018] Through such an arrangement: the function of driving the oil cylinder to move is achieved.

[0019] Preferably, it also includes a secondary oil return pipe, which is connected to the oil inlet pipe, the piston tube is connected to an oil delivery port, the oil delivery port is connected to the secondary oil return pipe, the secondary oil return pipe is equipped with a throttle valve, the oil delivery port is located on the secondary oil return pipe between the throttle valve and the oil inlet pipe, and the main oil return pipe is equipped with an overflow valve.

[0020] Through such an arrangement, the function of inputting hydraulic oil into the piston tube is achieved.

[0021] Preferably, the oil inlet pipe is installed with a one-way valve, and the one-way valve is located between the auxiliary oil return pipe and the reversing valve.

[0022] This arrangement can prevent the drive cylinder from accidentally moving.

[0023] Preferably, the oil inlet pipe is installed with a solenoid valve, and the auxiliary oil return pipe is connected with the oil inlet pipe between the reversing valve and the solenoid valve.

[0024] This arrangement prevents the drive cylinder from accidentally moving.

[0025] Preferably, two fork assemblies are provided, and the limit screws on the two fork assemblies are staggered.

[0026] Through such an arrangement, the reliability and movement range can be improved.

[0027] Compared with the prior art, the utility model has achieved beneficial technical effects:

[0028] 1. During the rotation of the fork arm, the screw head is clamped with the fork arm, which can play a role in positioning the fork arm and facilitate the positioning of the rotation angle of the fork arm, thereby achieving the advantage of easy use.

[0029] 2. Turn the limit screw on the limit seat to move the limit screw on the limit seat to which it is threaded, driving the screw head to move. By adjusting the position of the screw head, the fork arm and the screw head are in a suitable position when they are engaged, ensuring the positioning accuracy of the screw head to the fork arm and preventing positioning deviations due to wear during use, which may lead to the problem of unusability.

[0030] 3. After the position of the limit screw is adjusted, tighten the locking nut to make it press against the limit seat. The limit seat, locking nut and limit screw are locked through friction, thereby achieving the function of locking the limit screw and the screw head. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a structural schematic diagram of a fork reversible fork clamp device in an embodiment of the utility model;

[0032] Figure 2 It is a schematic diagram of the structure of the limit seat, the locking pin and the locking mechanism in the embodiment of the utility model;

[0033] Figure 3 It is a schematic diagram of the connection structure of the oil inlet pipe, the main oil return pipe and the auxiliary oil return pipe in the embodiment of the utility model.

[0034] The technical features indicated by the reference numerals are as follows:

[0035] 11. Forklift connecting frame; 12. Sliding frame; 13. Fork arm; 14. Driving cylinder; 21. Limit seat; 22. Limit screw; 23. Screw head; 24. Locking nut; 31. Connecting seat; 32. Locking pin; 33. Locking groove; 34. Piston tube; 35. Piston block; 36. Piston rod; 37. Sealing plate; 38. Elastic part; 41. Oil inlet pipe; 42. Main oil return pipe; 43. Reversing valve; 44. Overflow valve; 45. Check valve; 46. Solenoid valve; 51. Auxiliary oil return pipe; 52. Oil delivery port; 53. Throttle valve. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments, but the scope of protection claimed in the utility model is not limited to the following specific embodiments.

[0037] refer to Figure 1 A fork reversible fork clamp device includes a forklift connecting frame 11, a fork assembly, an oil inlet pipe 41, a main oil return pipe 42, a reversing valve 43, and an auxiliary oil return pipe 51. The fork assembly is installed on the forklift connecting frame 11. Two fork assemblies are provided, and the two fork assemblies are symmetrically arranged.

[0038] refer to Figure 1 and Figure 2The fork assembly includes a sliding frame 12 and a fork arm 13. The sliding frame 12 is slidably connected to the forklift connecting frame 11. The fork arm 13 can be rotatably installed on the sliding frame 12. The sliding frame 12 is provided with a driving cylinder 14. The two ends of the driving cylinder 14 are rotatably connected to the sliding frame 12 and the fork arm 13 respectively. The sliding frame 12 is fixedly connected to a limit seat 21. The limit seat 21 is threadedly connected to a limit screw 22. The limit screw 22 is threadedly connected to a locking nut 24. The locking nut 24 is clamped with the limit seat 21. The limit screw 22 is fixedly connected to a screw head 23. The screw head 23 is located on one end of the limit screw 22 close to the fork arm 13, and the screw head 23 is clamped with the fork arm 13. The fork arm 13 is provided with two locking grooves 33, and the two locking grooves 33 are spaced 90 degrees apart. There are two limit seats 21, limit screws 22 and screw heads 23, and the two limit seats 21, limit screws 22 and screw heads 23 correspond to each other. The two screw heads 23 are respectively located on both sides of the fork arm 13. The limit screws 22 on the two fork assemblies are staggered.

[0039] The sliding frame 12 is fixedly connected with a connecting seat 31, and the connecting seat 31 is slidably connected with a locking pin 32. The fork arm 13 is provided with a locking groove 33 matched with the locking pin 32. The sliding frame 12 is provided with a locking mechanism for driving the locking pin 32 to slide on the connecting seat 31. The locking mechanism includes a piston tube 34, a piston block 35, a piston rod 36 and a sealing plate 37. The sealing plate 37 closes one end of the piston tube 34 close to the locking pin 32. The piston block 35 is located in the piston tube 34 and matches with the inner wall of the piston tube 34. The piston rod 36 is fixedly connected with the piston block 35. The piston rod 36 is penetrated by the sealing plate 37. One end of the piston rod 36 extending out of the piston tube 34 is fixedly connected with the locking pin 32. An elastic member 38 is provided between the sealing plate 37 and the locking pin 32. The elastic member 38 is a spring whose two ends are respectively in contact with the sealing plate 37 and the locking pin 32.

[0040] refer to Figure 2 and Figure 3, the oil inlet pipe 41 and the main oil return pipe 42 are respectively connected to the reversing valve 43, and the reversing valve 43 is connected to the driving oil cylinder 14. The reversing valve 43 is used to switch the flow direction of the hydraulic oil entering the driving oil cylinder 14, and can play a role in adjusting the movement direction of the driving oil cylinder 14, so as to drive the fork arm 13 to rotate in different directions. The auxiliary oil return pipe 51 is connected to the oil inlet pipe 41, and the piston tube 34 is connected to the oil delivery port 52, and the oil delivery port 52 is connected to the auxiliary oil return pipe 51. The auxiliary oil return pipe 51 is equipped with a throttle valve 53. The oil delivery port 52 is located between the throttle valve 53 and the oil inlet pipe 41 on the auxiliary oil return pipe 51, and the main oil return pipe 42 is equipped with a relief valve 44. The end of the auxiliary oil return pipe 51 away from the main oil return pipe 42 is connected to the hydraulic oil circuit of the forklift. The flow rate of the hydraulic oil input into the oil inlet pipe 41 is greater than the flow rate of the throttle valve 53, so that the hydraulic oil can enter the main oil return pipe 42 through the oil inlet pipe 41. The oil inlet pipe 41 is provided with a one-way valve 45, which is located between the auxiliary oil return pipe 51 and the reversing valve 43. The oil inlet pipe 41 is provided with a solenoid valve 46, which is connected to the auxiliary oil return pipe 51 and the oil inlet pipe 41 between the reversing valve 43 and the solenoid valve 46.

[0041] The forklift connecting frame 11 is installed on the forklift, and the forklift drives the fork arm 13 to move, so that the fork arm 13 can be used to transport goods. The oil inlet pipe 41 and the main oil return pipe 42 are connected to the hydraulic oil circuit of the forklift, and hydraulic oil is input into the oil inlet pipe 41 through the hydraulic oil circuit of the forklift. The driving cylinder 14 is extended and shortened by the hydraulic oil, and the driving cylinder 14 drives the fork arm 13 to rotate on the sliding frame 12, realizing the function of driving the fork arm 13 to rotate, so that the fork arm 13 can lift and clamp the goods. While the hydraulic oil is injected into the hydraulic cylinder in the oil inlet pipe 41, the hydraulic oil is input into the piston tube 34 through the auxiliary oil return pipe 51, and the driving piston block 35 drives the locking pin 32 to move in the direction away from the locking groove 33, and the locking pin 32 is pulled out from the locking groove 33, so that the fork arm 13 can rotate on the sliding frame 12. After the oil inlet pipe 41 stops inputting hydraulic oil to the driving cylinder 14 , the elastic member 38 drives the locking pin 32 to insert into the locking groove 33 , and the hydraulic oil in the piston tube 34 flows back into the hydraulic oil circuit of the forklift through the throttle valve 53 .

[0042] This embodiment has the following advantages:

[0043] During the rotation of the fork arm 13, the screw head 23 is engaged with the fork arm 13, so as to position the fork arm 13 and facilitate the positioning of the rotation angle of the fork arm 13, thereby achieving the advantage of convenient use.

[0044] The limit screw 22 is rotated on the limit seat 21 to move the limit screw 22 on the limit seat 21 to which it is threadedly connected, thereby driving the screw head 23 to move. By adjusting the position of the screw head 23, the fork arm 13 and the screw head 23 are in a suitable position when they are engaged, thereby ensuring the positioning accuracy of the screw head 23 on the fork arm 13 and preventing the problem of unusability caused by positioning deviation due to wear during use.

[0045] After the position of the limit screw 22 is adjusted, the locking nut 24 is tightened to make the locking nut 24 press against the limit seat 21, and the limit seat 21, the locking nut 24 and the limit screw 22 are locked by friction, thereby achieving the function of locking the limit screw 22 and the screw head 23.

[0046] The two screw heads 23 located on both sides of the fork arm 13 can respectively position the rotation angle of the fork arm 13, so that the fork arm 13 can be positioned to a state of lifting goods and a state of clamping goods respectively through the two screw heads 23.

[0047] The locking pin 32 is driven into the locking groove 33 through the locking mechanism, so that the locking pin 32 is engaged with the fork arm 13, so that the fork arm 13 can remain in a locked state after rotating to a suitable angle, thereby preventing the fork arm 13 from rotating and improving the stability of the fork arm 13.

[0048] By inputting hydraulic oil between the piston block 35 and the sealing plate 37, the hydraulic oil pushes the piston block 35 to move in the piston tube 34, and the piston block 35 drives the piston rod 36 and the locking pin 32 to move away from the locking groove 33, thereby realizing the function of the locking mechanism driving the locking pin 32 to move.

[0049] The elastic member 38 exerts an elastic force on the locking pin 32 , so that the locking pin 32 has a tendency to be inserted into the locking groove 33 , thereby keeping the locking pin 32 in a state of being inserted into the locking groove 33 .

[0050] The oil inlet pipe 41 and the main oil return pipe 42 are connected to the hydraulic oil circuit of the forklift. The forklift sends hydraulic oil into the oil inlet pipe 41 through a hydraulic pump. The hydraulic oil in the oil inlet pipe 41 is sent into the driving cylinder 14 through a reversing valve 43. The hydraulic oil in the driving cylinder 14 flows back to the hydraulic oil circuit of the forklift through the main oil return pipe 42, thereby realizing the function of driving the driving cylinder 14 to move.

[0051] In the process of the hydraulic oil flowing from the oil inlet pipe 41 to the main oil return pipe 42, the relief valve 44 is set so that the hydraulic oil in the oil inlet pipe 41, the main oil return pipe 42 and the auxiliary oil return pipe 51 have a positive pressure, so that the hydraulic oil in the auxiliary oil return pipe 51 enters the piston tube 34 through the oil delivery port 52, thereby realizing the function of inputting hydraulic oil into the piston tube 34.

[0052] The one-way valve 45 is provided to prevent the hydraulic oil in the driving cylinder 14 from flowing into the auxiliary oil return pipe 51 through the oil inlet pipe 41 , thereby preventing the driving cylinder 14 from accidentally moving.

[0053] When the solenoid valve 46 is closed, the hydraulic oil in the oil inlet pipe 41 stops flowing, which plays a role in controlling the flow state of the hydraulic oil in the oil inlet pipe 41 and preventing the driving cylinder 14 from moving unexpectedly.

[0054] The limit screws 22 on the two fork assemblies are staggered to prevent the limit screws 22 on the two fork assemblies from colliding with each other, thereby improving reliability and movement stroke.

[0055] According to the disclosure and teaching of the above specification, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. A fork reversible fork clamp device, characterized in that: The forklift comprises a forklift connecting frame (11) and a fork assembly, wherein the fork assembly comprises a sliding frame (12) and a fork arm (13), wherein the sliding frame (12) is slidably connected to the forklift connecting frame (11), and the fork arm (13) is rotatably mounted on the sliding frame (12), and the sliding frame (12) is provided with a driving cylinder (14), and the two ends of the driving cylinder (14) are respectively rotatably connected to the sliding frame (12) and the fork arm (13), and the sliding frame (12) is fixed. A limit seat (21) is connected, the limit seat (21) is threadedly connected to a limit screw (22), the limit screw (22) is threadedly connected to a locking nut (24), the locking nut (24) is clamped with the limit seat (21), the limit screw (22) is fixedly connected to a screw head (23), the screw head (23) is located on one end of the limit screw (22) close to the fork arm (13), and the screw head (23) is clamped with the fork arm (13).

2. The fork reversible fork clamp device according to claim 1, characterized in that: The limiting seats (21), limiting screws (22) and screw heads (23) are provided in two in total, and the two limiting seats (21), limiting screws (22) and screw heads (23) correspond to each other one by one, and the two screw heads (23) are respectively located on both sides of the fork arm (13).

3. The fork reversible fork clamp device according to claim 1, characterized in that: The sliding frame (12) is fixedly connected to a connecting seat (31), the connecting seat (31) is slidably connected to a locking pin (32), the fork arm (13) is provided with a locking groove (33) matched with the locking pin (32), and the sliding frame (12) is provided with a locking mechanism for driving the locking pin (32) to slide on the connecting seat (31).

4. The fork reversible fork clamp device according to claim 3, characterized in that: The locking mechanism comprises a piston tube (34), a piston block (35), a piston rod (36) and a sealing plate (37); the sealing plate (37) seals one end of the piston tube (34) close to the locking pin (32); the piston block (35) is located in the piston tube (34) and cooperates with the inner wall of the piston tube (34); the piston rod (36) is fixedly connected to the piston block (35); the piston rod (36) passes through the sealing plate (37); and one end of the piston rod (36) extending out of the piston tube (34) is fixedly connected to the locking pin (32).

5. The fork reversible fork clamp device according to claim 4, characterized in that: An elastic member (38) is provided between the sealing plate (37) and the locking pin (32).

6. The fork reversible fork clamp device according to claim 5, characterized in that: It also includes an oil inlet pipe (41), a main oil return pipe (42), and a reversing valve (43); the oil inlet pipe (41) and the main oil return pipe (42) are respectively connected to the reversing valve (43); and the reversing valve (43) is connected to the driving oil cylinder (14).

7. The fork reversible fork clamp device according to claim 6, characterized in that: The invention also comprises an auxiliary oil return pipe (51), the auxiliary oil return pipe (51) being in communication with the oil inlet pipe (41), the piston pipe (34) being in communication with an oil delivery port (52), the oil delivery port (52) being in communication with the auxiliary oil return pipe (51), the auxiliary oil return pipe (51) being provided with a throttle valve (53), the oil delivery port (52) being located on the auxiliary oil return pipe (51) between the throttle valve (53) and the oil inlet pipe (41), and the main oil return pipe (42) being provided with an overflow valve (44).

8. The fork reversible fork clamp device according to claim 7, characterized in that: The oil inlet pipe (41) is provided with a one-way valve (45), and the one-way valve (45) is located between the auxiliary oil return pipe (51) and the reversing valve (43).

9. The fork reversible fork clamp device according to claim 7, characterized in that: The oil inlet pipe (41) is provided with a solenoid valve (46), and the auxiliary oil return pipe (51) is connected to the oil inlet pipe (41) between the reversing valve (43) and the solenoid valve (46).

10. The fork reversible fork clamp device according to claim 1, characterized in that: A total of two fork assemblies are provided, and the limit screws (22) on the two fork assemblies are staggered.

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