Folding pallet fork, hydraulic system and forklift

Abstract

The utility model provides a folding pallet fork, a hydraulic system and a forklift truck, which comprise a side shifting fork frame, a lifting frame and a first driving piece connected between the side shifting fork frame and the lifting frame, the side shifting fork frame is in sliding connection with the lifting frame in the vertical direction, and the lifting frame is in sliding connection with the lifting frame in the vertical direction. A standard fork and a folding fork are connected to the bottom of the side moving fork frame, the standard fork and the folding fork are arranged in a spaced mode, the folding fork is hinged to the side moving fork frame, the bottom of the lifting frame is hinged to the folding fork, and when the first driving piece pushes the lifting frame to move upwards, the folding fork is driven by the first driving piece to move upwards. And the folding fork is driven to be upwards overturned and folded around a hinge point of the folding fork and the side shifting fork frame. Switching of two structures of a standard pallet fork and a multi-fork-plate pallet fork is achieved. The forklift can be suitable for various operation scenes such as pallets and no pallets, and the universality and the operation efficiency of the forklift are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fork truck technical field especially relates to a folding fork, hydraulic system and fork truck. BACKGROUND

[0002] In the prior art, the standard fork of the fork truck, as its core tool, is usually composed of two fork plates spaced apart by a certain distance. This structure can adapt to the handling needs of most pallets and cargos. However, in actual logistics handling scenarios, it is very common to handle materials such as bagged feed, fertilizer, and grain. These materials usually appear in bagged form, and often use a pallet-free operation method during handling. The operator will use the fork truck to directly fork the stacked bagged cargo, and then push it into the truck compartment to complete the loading operation. The standard fork of the fork truck cannot stably support the bagged cargo in this operation method, and often causes the cargo to fall off due to unbalanced support of the bagged cargo. Not only does this affect the handling efficiency, but it can also cause damage to the cargo and safety hazards. SUMMARY

[0003] To solve the technical problems existing in the prior art, the utility model provides a folding fork, hydraulic system and fork truck which can be used in various operation scenarios, improving the versatility and operation efficiency of the fork truck.

[0004] To achieve the above-mentioned purpose, the utility model provides a folding fork in the first aspect, which comprises a side-moving fork frame, a lifting frame, and a first driving member connected between the side-moving fork frame and the lifting frame. The side-moving fork frame and the lifting frame are vertically slidingly connected. The bottom of the side-moving fork frame is connected with a standard fork and a folding fork arranged at intervals with the standard fork. The folding fork is hinged to the side-moving fork frame, and the bottom of the lifting frame is hinged to the folding fork. When the first driving member pushes the lifting frame to move upward, it drives the folding fork to flip and fold upward around the hinge point between the folding fork and the side-moving fork frame.

[0005] Further, the folding fork comprises a plurality of fork plates arranged at intervals. The rear end of each fork plate is connected with a hanging plate. A plurality of hanging plates are connected as a whole by a connecting beam. The side surface of the hanging plate on both sides of the folding fork is provided with a first ear seat hinged to the lifting frame, and the top is provided with a second ear seat hinged to the side-moving fork frame.

[0006] Further, the folding fork further comprises a push-out plate and an extension frame connected between the push-out plate and the lifting frame. The push-out plate, the extension frame, and the lifting frame form a multi-linkage mechanism.

[0007] Further, the telescopic frame comprises a first support, a second support, a first connecting rod frame and a second connecting rod frame, the upper end of the first support is slidably connected with the pushing plate, the lower end is hingedly connected with the lower end of the second support, the upper end of the second support is slidably connected with the lifting frame, the middle of the first support is hingedly connected with the middle of the first connecting rod frame, the lower end of the first connecting rod frame is hingedly connected with the pushing plate, the upper end is hingedly connected with the second connecting rod frame, the middle of the second connecting rod frame is hingedly connected with the middle of the second support, and the lower end is hingedly connected with the lifting frame, wherein the second driving member is connected between the first connecting rod frame and the second connecting rod frame.

[0008] Further, the side-moving fork frame comprises a support frame connected with the forklift mast and a side-moving frame slidably connected with the support frame, a third driving member is connected between the support frame and the side-moving frame, and the fork plate and the folding fork are connected on the side-moving frame.

[0009] Further, the support frame and the side-moving frame are connected with an upper sliding block, a lower sliding block and a stop piece, lubricating oil grooves are arranged on the upper sliding block and the lower sliding block, and the stop piece is fixed on the support frame and used for limiting the moving distance of the side-moving frame.

[0010] Further, the support frame is provided with a main roller, a composite roller and a side roller at the connection position with the forklift mast.

[0011] Further, the lifting frame comprises a main frame, the bottom of the main frame is provided with a third ear seat hingedly connected with the folding fork and a fourth ear seat hingedly connected with the telescopic frame, and the upper portion of the main frame is provided with an inner guide rail slidably connected with the telescopic frame.

[0012] Further, the first connecting rod frame comprises a first vertical plate group, the upper end of the first vertical plate group is provided with a shaft hole, and the lower end is provided with a first swing arm hingedly connected with the pushing plate; the second connecting rod frame comprises a second vertical plate group, the upper end of the second vertical plate group is provided with a sleeve matched with the shaft hole of the first vertical plate group, and the lower end is provided with a second swing arm hingedly connected with the lifting frame.

[0013] The second aspect of the utility model provides a kind of hydraulic system based on the folding fork above, comprising sequentially connected hydraulic oil tank, gear pump and multi-way valve, wherein multi-way valve is five joint valve, the first joint of multi-way valve is connected with steering oil cylinder, the second joint is connected with lifting oil cylinder, the third joint is connected with inclination oil cylinder, the fourth joint is connected with the third driving member, the fifth joint is connected with electromagnetic valve, and the electromagnetic valve is connected with first driving member, the second driving member.

[0014] The third aspect of the utility model provides a kind of forklift, comprising the folding fork above, or the hydraulic system above.

[0015] Compared with prior art, the utility model has the advantages that:

[0016] The folding fork of the utility model, including standard fork and folding fork which is set apart with standard fork, when drive mechanism promotes lifting frame to move upward, can drive folding fork to turn over and fold upward, to realize the switching of standard fork and multi-fork plate fork two structures. Can be applicable to tray, trayless and other various operation scenes, improve the versatility and operation efficiency of forklift. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is structure schematic drawing of folding fork of the utility model;

[0018] Figure 2 It is structure schematic drawing of side shift fork frame of the utility model;

[0019] Figure 3 It is sectional view of side shift fork frame of the utility model;

[0020] Figure 4 It is structure schematic drawing of support frame of the utility model;

[0021] Figure 5 It is structure schematic drawing of support frame of the utility model;

[0022] Figure 6 It is structure schematic drawing of side shift frame of the utility model;

[0023] Figure 7 It is structure schematic drawing of lifting frame of the utility model;

[0024] Figure 8 It is structure schematic drawing of main frame of the utility model;

[0025] Figure 9 It is structure schematic drawing of base assembly of the utility model;

[0026] Figure 10 It is structure schematic drawing of telescopic frame of the utility model;

[0027] Figure 11 It is structure schematic drawing of first support of the utility model;

[0028] Figure 12 It is structure schematic drawing of first connecting rod frame of the utility model;

[0029] Figure 13 It is structure schematic drawing of second connecting rod frame of the utility model;

[0030] Figure 14 It is structure schematic drawing of folding fork of the utility model;

[0031] Figure 15 It is structure schematic drawing of push-out plate of the utility model;

[0032] Figure 16 The hydraulic principle diagram of the hydraulic system of the utility model;

[0033] In the drawing,

[0034] 1, side shift fork frame; 11, support frame; 111, support frame main body; 1111, frame upper cross beam; 1112, support frame lower cross beam; 1113, rib plate; 1114, reinforcing rib; 1115, connecting vertical plate; 1116, roller shaft; 1117, limiting column; 1118, hanging chain plate; 112, adjustable direction angle tunnel; 113, throttle piece; 114, main roller; 115, check ring; 116, composite roller; 117, side roller; 118, spacer sleeve; 12, side shift frame; 121, side shift frame upper cross beam; 122, side shift frame lower cross beam; 123, side plate; 124, oil cylinder guard plate; 125, outer guide rail; 126, fifth lug; 127, hanging plate; 128, fork plate; 129, fork plate lower hook; 12A, triangular reinforcing rib; 12B, lifting cylinder lug; 13, upper sliding block; 14, lower sliding block; 15, third driving member; 16, baffle; 17, guide sleeve; 18, dustproof sealing ring; 2, lifting frame; 21, main frame; 22, third lug; 23, bottom plate; 24, electromagnetic valve fixing plate; 25, limiting block; 211, base assembly; 212, middle reinforcing beam; 213, upper reinforcing beam; 214, inner guide rail; 215, lifting cylinder base; 211, base assembly; 2111, fourth lug; 2112, lower reinforcing plate; 2113, lower reinforcing beam; 3, telescopic frame; 31, first support; 311, vertical plate; 312, wing plate; 32, second support; 35, string rod; 36, roller; 37, second driving member; 33, first connecting rod frame; 331, first vertical plate group; 332, short pad plate; 333, first swing arm; 334, cover plate a; 335, cover plate b; 336, shaft sleeve; 34, second connecting rod frame; 341, second vertical plate group; 342, pipe clamp fixing plate; 343, sleeve; 344, cover plate; 345, long pad plate; 346, pad block; 4, folding fork; 41, first lug; 42, second lug; 43, connecting beam; 5, push-out plate; 51, connecting seat; 52, panel; 53, channel steel; 54, reinforcing plate a; 55, reinforcing plate b; 6, electromagnetic valve; 7, first driving member; 8, connecting plate. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] The present application is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Each aspect thus defined can be combined with any other aspect or aspects, unless explicitly stated otherwise. In particular, any feature that is considered to be preferred or advantageous can be combined with any other feature or features that are considered to be preferred or advantageous.

[0037] In the description of the present application, it should be understood that the terms "inner", "outer", "upper", "lower", "left" and "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0038] Reference Figures 1 to 4 As shown in the drawings, the present application discloses a folding fork, comprising a side shift fork frame 1, a lifting frame 2 and a first driving member 7 connected between the side shift fork frame 1 and the lifting frame 2, the side shift fork frame 1 and the lifting frame 2 are slidingly connected in the vertical direction, the bottom of the side shift fork frame 1 is connected with a standard fork, and a folding fork 4 is arranged in the space between the standard fork, wherein the folding fork 4 is hinged with the side shift fork frame 1, and the bottom of the lifting frame 2 is hinged with the folding fork 4. Preferably, the first driving member 7 is a lifting oil cylinder; when the first driving member 7 pushes the lifting frame 2 to move upward, it drives the folding fork 4 to overturn and fold upward around the hinge point of the folding fork 4 and the side shift fork frame 1. To realize the switching of the two structures of standard fork and multi-fork plate fork; it can be applied to various operation scenes such as pallet and non-pallet, improving the versatility and operation efficiency of the forklift.

[0039] In some embodiments, the side shift fork frame 1 comprises a support frame 11 connected with the forklift mast, a side shift frame 12 slidingly connected with the support frame 11, a third driving member 15 connected between the support frame 11 and the side shift frame 12, a fork plate 128 and a folding fork 4 connected on the side shift frame 12, preferably, the third driving member 15 is a side shift oil cylinder, which is used to drive the side shift frame 12 to move left and right relative to the support frame 11.

[0040] Specifically, the side shift fork 1 further comprises an upper sliding block 13, a lower sliding block 14, a baffle 16, a guide sleeve 17, and a dustproof sealing ring 18. The upper sliding block 13 and the lower sliding block 14 are connected between the support frame 11 and the side shift frame 12, and the upper sliding block 13 and the lower sliding block 14 are each provided with a lubricating oil groove for lubricating the sliding between the support frame 11 and the side shift frame 12. The baffle 16 is fixed on the support frame 11 and is used to limit the movement distance of the side shift frame 12.

[0041] In some embodiments, the support frame 11 comprises a support frame body 111, the support frame body 111 comprises an upper frame beam 1111, a lower support frame beam 1112, a rib plate 1113, a reinforcing rib 1114, and a connecting vertical plate 1115, and the upper frame beam 1111, the lower support frame beam 1112, the rib plate 1113, the reinforcing rib 1114, and the connecting vertical plate 1115 form a frame structure. The connecting vertical plate 1115 is connected with a main roller 114 and a composite roller 116 through a roller shaft 1116 arranged on the side surface of the connecting vertical plate 1115, and a retaining ring 115 is arranged between the main roller 114 and the composite roller 116 and the roller shaft 1116. A side roller 117 is arranged on the top of the side surface of the connecting vertical plate 1115, and a spacer sleeve 118 is arranged between the side roller 117 and the connecting vertical plate 1115. A limiting column 1117 is arranged on the front surface of the connecting vertical plate 1115. The lower end of the support frame body 111 is provided with a hanging chain plate 1118.

[0042] The side shift frame 12 comprises an upper side shift frame beam 121, a lower side shift frame beam 122, and a side plate 123, and the upper side shift frame beam 121, the lower side shift frame beam 122, and the side plate 123 form a frame structure. The side of the side shift frame 12 away from the support frame 11 is provided with an outer guide rail 125 for sliding connection with the lifting frame 2, a lifting cylinder ear seat 12B, and an oil cylinder guard plate 124. The two ends of the side of the side shift frame 12 away from the support frame 11 are provided with a fifth ear seat 126 for hinging with the folding fork 4, and the lower end is provided with a standard fork comprising a fork plate 128, a hanging plate 127, and a triangular reinforcing rib 12A connected between the fork plate 128 and the hanging plate 127.

[0043] In some embodiments, the lifting frame 2 comprises a main frame 21, the main frame 21 comprises a base assembly 211, a middle reinforcing beam 212, an upper reinforcing beam 213, and an inner guide rail 214, wherein the inner guide rail 214 is used for sliding cooperation with the outer guide rail 125 of the side shift frame 12 and the telescopic frame 3. The main frame 21 is connected with a bottom plate 23 and a limiting block 25. The bottom of the main frame 21 is provided with a third ear seat 22 for hinging with the folding fork 4 and a fourth ear seat 2111 for hinging with the telescopic frame 3. The base assembly 211 comprises the fourth ear seat 2111, a lower reinforcing plate 2112, and a lower reinforcing beam 2113. The side surface of the main frame 21 is provided with an electromagnetic valve fixing plate 24 and a lifting cylinder base 215.

[0044] In some embodiments, the folding fork 4 comprises a plurality of spaced apart fork plates 128, preferably three fork plates 128 located at the left, middle and right of the standard fork respectively. The rear end of each fork plate 128 is connected to a hanging plate 127, and the plurality of hanging plates 127 are connected together by a connecting beam 43. The side surface of the hanging plates 127 located at both sides of the folding fork 4 is provided with a first ear seat 41, and the lifting frame 2 is hinged to the first ear seat 41 through a connecting plate 8. The top of the hanging plate 127 is provided with a second ear seat 42 hinged to the side shifting fork frame 1. When the first driving member 7 pushes the lifting frame 2 to move upward, the lifting frame 2 drives the folding fork 4 to overturn and fold upward around the hinge point of the second ear seat 42 through the connecting plate 8 and the first ear seat 41.

[0045] In some embodiments, the folding fork further comprises a pushing-out plate 5 and a telescopic frame 3 connected between the pushing-out plate 5 and the lifting frame 2, and the pushing-out plate 5, the telescopic frame 3 and the lifting frame 2 constitute a multi-linkage mechanism.

[0046] Specifically, the telescopic frame 3 comprises a first support 31, a second support 32, a first connecting rod frame 33 and a second connecting rod frame 34. The upper end of the first support 31 is slidingly connected to the pushing-out plate 5, and the lower end is hinged to the lower end of the second support 32. The upper end of the second support 32 is slidingly connected to the lifting frame 2. The middle of the first support 31 is hinged to the middle of the first connecting rod frame 33. The lower end of the first connecting rod frame 33 is hinged to the pushing-out plate 5, and the upper end is hinged to the second connecting rod frame 34. The middle of the second connecting rod frame 34 is hinged to the middle of the second support 32, and the lower end is hinged to the lifting frame 2. The second connecting rod frame 34 is connected to the first connecting rod frame 33. Preferably, the second driving member 37 is a pushing-out oil cylinder. When the piston rod of the pushing-out oil cylinder is extended, the pushing-out plate 5 is driven outward by the multi-linkage mechanism to push the goods on the fork to a predetermined position, completing the unloading of the goods. The telescopic frame 3 has a compact structure, reduces the occupation of the overall space of the forklift, and greatly improves the working efficiency of the forklift.

[0047] In some embodiments, the first support 31 comprises two vertical plates 311, each vertical plate 311 is provided with an axle hole at the upper end and the middle, and the lower end of the vertical plate 311 is connected to a wing plate 312, and the lower end of the wing plate 312 is provided with an axle hole. Preferably, the axle holes at the upper ends of the two vertical plates 311 are connected together by a string rod 35, and the two ends of the string rod 35 are connected to rollers 36 for sliding connection with the pushing-out plate 5. The second support 32 comprises two vertical plates 32, each vertical plate 32 is provided with an axle hole at the upper end, the middle and the lower end. The axle hole at the lower end of the second support 32 is hinged to the wing plate 312 of the first support 31 through an axle pin, and the axle hole at the upper end of the second support 32 is connected to a roller 36 for sliding connection with the inner guide rail 214 of the lifting frame 2 through an axle pin.

[0048] The first connecting rod frame 33 is two in number, each first connecting rod frame 33 comprises a first vertical plate group 331, the upper end and the middle of the first vertical plate group 331 are provided with shaft holes, the outer side of the middle shaft hole is provided with a short pad plate 332, which is used for reducing the abrasion between the first support 31 and the first connecting rod frame 33. The lower end of the first connecting rod frame 33 is provided with a first swing arm 333 hinged with the push-out plate 5, cover plate a 334 and cover plate b 335. The inner side of the first vertical plate group 331 is provided with a shaft sleeve 336 hinged with the second driving member 37. The second connecting rod frame 34 comprises a second vertical plate group 341, the upper end of the second vertical plate group 341 is provided with a sleeve 343 matched with the shaft hole of the first vertical plate group 331, and the lower end is provided with a second swing arm hinged with the fourth ear seat 2111 of the lifting frame 2. The second connecting rod frame 34 further comprises a pipe clamp fixing plate 342, cover plate c 344, a long pad plate 345 and a pad block 346

[0049] In some embodiments, the push-out plate 5 comprises a connecting seat 51 hinged with the first swing arm 333 of the first connecting rod frame 33, a face plate 52, a channel steel 53 in sliding connection with the first support 31, a reinforcing plate a 54 and a reinforcing plate b 55

[0050] In addition, the mainstream electric counterbalance forklift on the market can be additionally configured with at most two sets of accessory actions, i.e. four sets of multi-way valves. Due to the limitation of the overall width and the driving axle and other components, if a customer additionally requires one set of accessory action, there is no suitable space to arrange the fifth set of hydraulic valve group.

[0051] To solve the above problems, the utility model discloses a kind of hydraulic systems, comprising hydraulic oil tank, gear pump and multi-way valve connected in sequence, wherein the multi-way valve is five-way valve, the first connection of multi-way valve is connected with steering cylinder, the second connection is connected with lifting cylinder, the third connection is connected with tilting cylinder, the fourth connection is connected with third driving member 15, the fifth connection is connected with solenoid valve 6, solenoid valve 6 is connected with first driving member 7, second driving member 37, preferably, first driving member 7 is lifting cylinder, second driving member 37 is push-out cylinder, third driving member 15 is side shift cylinder.

[0052] When side shifting, when lifting side shift control lever, oil outlet A3 of five-way valve, oil return B3 of five-way valve, accessory right side shift;When pressing side shift control lever, oil inlet B3 of five-way valve, oil return A3 of five-way valve, accessory left side shift.

[0053] When the forks are folded, the electromagnetic valve 6 is de-energized, when the folding control lever is lifted, hydraulic oil enters the oil port C1 of the electromagnetic valve 6 through the oil port A4 of the five-way valve, and then enters the rodless cavity of the two lifting oil cylinders, the piston rod of the lifting oil cylinder is extended, the lifting frame 2 moves upward, the folding forks 4 are turned upward by 90 degrees through the connecting plate 8 and the pin shaft, and then the hydraulic oil returns to the oil port C2 and the oil port B4 of the electromagnetic valve 6 through the rod cavity of the lifting cylinder; when the folding control lever is pressed, the hydraulic oil enters the oil port C2 of the electromagnetic valve 6 through the oil port B4 of the five-way valve, and then enters the rod cavity of the two lifting cylinders, the piston rod of the lifting cylinder is retracted, the folding forks 4 are turned downward by 90 degrees and are parallel to the ground, and then the hydraulic oil returns to the oil port C1 of the electromagnetic valve 6 and the oil port A4 of the five-way valve through the rodless cavity of the lifting oil cylinder, and the forklift carries out the goods taking operation.

[0054] When pushing out, first, the folding forks are ensured to be turned downward by 90 degrees and parallel to the ground, the electromagnetic valve 6 is energized, when the pushing-out control lever is lifted, hydraulic oil enters the oil port C3 of the electromagnetic valve 6 through the oil port A4 of the five-way valve, and then enters the rodless cavity of the two pushing-out oil cylinders, the piston rod of the pushing-out oil cylinder is extended, the telescopic frame 3 is unfolded, and the panel 52 pushes out the goods. Then the hydraulic oil returns to the oil port C4 of the electromagnetic valve 6 and the oil port B4 of the five-way valve through the rod cavity of the pushing-out oil cylinder; when the pushing-out control lever is pressed, the hydraulic oil enters the oil port C4 of the electromagnetic valve 6 through the oil port B4 of the five-way valve, and then enters the rod cavity of the two pushing-out oil cylinders, the piston rod of the pushing-out oil cylinder is retracted, the telescopic frame 3 is retracted, the panel 52 is returned, and then the hydraulic oil returns to the oil port C3 of the electromagnetic valve 6 and the oil port A4 of the five-way valve through the rodless cavity of the pushing-out oil cylinder.

[0055] The utility model discloses still disclose a kind of forklift, including above-mentioned folding fork, or above-mentioned hydraulic system.

[0056] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application. These changes and improvements are all within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A folding fork, characterized in that, The utility model provides a folding fork, including side shift fork (1), lift frame (2) and first drive (7) connected between side shift fork (1) and lift frame (2), side shift fork (1) is connected with lift frame (2) in vertical direction slidingly, bottom of side shift fork (1) is connected with standard fork, and folding fork (4) is arranged at interval with standard fork, wherein, folding fork (4) is hinged with side shift fork (1), bottom of lift frame (2) is hinged with folding fork (4), when first drive (7) promotes lift frame (2) and moves upwards, folding fork (4) is driven and turns over and folds upwards around the hinge point of folding fork (4) and side shift fork (1).

2. The folding fork of claim 1, wherein, The folding fork (4) comprises a plurality of spaced apart fork plates (128), the rear end of each fork plate (128) is connected with a hanging plate (127), a plurality of hanging plates (127) are connected as a whole by a connecting beam (43), the side surface of the hanging plates (127) located on both sides of the folding fork (4) is provided with a first ear seat (41) hinged with the lift frame (2), and the top is provided with a second ear seat (42) hinged with the side shift fork (1).

3. The folding fork of claim 1, wherein, The folding fork further comprises a push-out plate (5) and a telescopic frame (3) connected between the push-out plate (5) and the lift frame (2), and the push-out plate (5), the telescopic frame (3) and the lift frame (2) constitute a multi-linkage mechanism.

4. The folding fork of claim 3, wherein, The telescopic frame (3) comprises a first support (31), a second support (32), a first connecting rod frame (33) and a second connecting rod frame (34), the upper end of the first support (31) is slidably connected with the push-out plate (5), the lower end is hinged with the lower end of the second support (32), the upper end of the second support (32) is slidably connected with the lift frame (2), the middle of the first support (31) is hinged with the middle of the first connecting rod frame (33), the lower end of the first connecting rod frame (33) is hinged with the push-out plate (5), the upper end is hinged with the second connecting rod frame (34), the middle of the second connecting rod frame (34) is hinged with the middle of the second support (32), and the lower end is hinged with the lift frame (2), wherein the second drive (37) is connected between the first connecting rod frame (33) and the second connecting rod frame (34).

5. The folding fork of claim 2, wherein, The side shift fork (1) comprises a support frame (11) connected with a forklift mast, a side shift frame (12) transversely slidably connected with the support frame (11), a third drive (15) connected between the support frame (11) and the side shift frame (12), and the fork plate (128) and the folding fork (4) are connected on the side shift frame (12).

6. The folding fork of claim 5, wherein, The support frame (11) and the side shift frame (12) are connected with an upper sliding block (13), a lower sliding block (14) and a stop plate (16), lubricating oil grooves are arranged on the upper sliding block (13) and the lower sliding block (14), the stop plate (16) is fixed on the support frame (11) and is used for limiting the movement distance of the side shift frame (12).

7. The folding fork of claim 5, wherein, The support frame (11) is provided with a main roller (114), a composite roller (116) and a side roller (117) at the connection with the forklift mast.

8. The folding fork of claim 3, wherein, The lifting frame (2) comprises a main frame (21), the bottom of the main frame (21) is provided with a third ear seat (22) hinged with the folding fork (4) and a fourth ear seat (2111) hinged with the telescopic frame (3), and the upper portion of the main frame (21) is provided with an inner guide rail (214) slidingly connected with the telescopic frame (3).

9. The folding fork of claim 4, wherein, The first connecting rod frame (33) comprises a first vertical plate group (331), the upper end of the first vertical plate group (331) is provided with a shaft hole, and the lower end is provided with a first swing arm (333) hinged with the pushing plate (5); the second connecting rod frame (34) comprises a second vertical plate group (341), the upper end of the second vertical plate group (341) is provided with a sleeve (343) matched with the shaft hole of the first vertical plate group (331), and the lower end is provided with a second swing arm hinged with the lifting frame (2).

10. Hydraulic system for folding forks according to any one of claims 1 to 9, characterized in that, The hydraulic system comprises a hydraulic oil tank, a gear pump and a multi-way valve connected in sequence, wherein the multi-way valve is a five-way valve, a steering oil cylinder is connected to the first way of the multi-way valve, a lifting oil cylinder is connected to the second way, an inclination oil cylinder is connected to the third way, the fourth way is connected with the third driving element (15), and an electromagnetic valve (6) is connected to the fifth way, the electromagnetic valve (6) is connected with the first driving element (7) and the second driving element (37).

11. A fork lift truck characterised in that, The folding fork according to any one of claims 1-9 or the hydraulic system according to claim 10.

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