Explosion-proof device for forklift lifting cylinder, fork mast and working method

Abstract

The present application belongs to the technical field of fluid pressure actuators, and relates to an explosion-proof device for a forklift lifting oil cylinder, a fork mast and a working method, comprising: a first end of a tee joint is connected with a corresponding oil way, a second end is connected with a distribution valve, and a communication mechanism is connected between third ends of the two tee joints; the communication mechanism comprises: an outer sleeve; both ends of the outer sleeve are provided with through holes to communicate the outer sleeve with the two tee joints; a pressure reduction assembly is arranged in the outer sleeve; when one of the oil ways leaks, the hydraulic oil in the normal oil way pushes the pressure reduction assembly to insert into the corresponding tee joint of the leaking oil way, so that the communication space between the first end and the second end of the corresponding tee joint of the leaking oil way is reduced, and the movement of the pressure reduction assembly causes the oil leakage hole provided on the outer sleeve to open, the hydraulic oil in the normal oil way is discharged through the oil leakage hole, and thus when one of the oil ways leaks, the fork mast is prevented from being twisted and damaged due to the excessively large oil pressure difference between the two lifting oil cylinders.

Description

Technical Field

[0001] This invention belongs to the technical field of fluid pressure actuators, specifically relating to fluid working systems, and more particularly to an explosion-proof device, fork mast, and working method for a forklift lifting cylinder. Background Technology

[0002] When a forklift lifts an object, the two forks bear different pressures, resulting in different pressures at the corresponding positions of the fork mast and the forks. At this time, the hydraulic oil is distributed through the distribution valve, and the lifting cylinder corresponding to the fork mast that bears the greater pressure will receive a larger oil pressure.

[0003] However, when a leak occurs in the hydraulic circuit connected to one of the lifting cylinders, the oil pressure in that circuit will decrease instantly. This causes the distribution valve to determine that the pressure on the forks corresponding to that circuit has decreased, and the distribution valve will further increase the oil pressure in the other normal hydraulic circuit. At this time, the oil pressure in the lifting cylinder corresponding to the leaking circuit decreases, while the oil pressure in the lifting cylinder corresponding to the normal circuit increases. The pressure difference between the two lifting cylinders further increases, causing the forks in the leaking circuit to descend, while the forks corresponding to the normal circuit remain stationary, resulting in the fork mast being twisted and damaged.

[0004] Therefore, when a leak occurs in the oil circuit connected to one of the lifting cylinders, the forks in the leaking circuit descend while the forks in the normal oil circuit remain stationary, leading to a technical problem of twisting and damage to the fork mast. It is necessary to design an explosion-proof device for the lifting cylinder of a forklift, a fork mast, and a working method.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one explosion-proof device for a forklift lifting cylinder, a fork mast, and a method of operation.

[0007] In a first aspect, embodiments of this disclosure provide an explosion-proof device for a forklift lifting cylinder, comprising:

[0008] A pair of three-way connectors, wherein the first end of the three-way connector is connected to the corresponding oil circuit, the second end is connected to the distribution valve, and a connecting mechanism is connected between the third ends of the two three-way connectors;

[0009] The oil circuit is connected to the corresponding lifting cylinder. After being distributed by the distribution valve, the hydraulic oil enters the corresponding oil circuit through the three-way connector and flows to the lifting cylinder.

[0010] The connecting mechanism includes: an outer sleeve;

[0011] Both ends of the outer sleeve are connected to the third end of the corresponding tee connector, and both ends of the outer sleeve are provided with through holes so that the outer sleeve can communicate with the two tee connectors;

[0012] The outer sleeve is equipped with a pressure reducing component. When one of the oil circuits leaks, the hydraulic oil in the normal oil circuit pushes the pressure reducing component into the tee joint corresponding to the leaking oil circuit, thereby reducing the communication space between the first and second ends of the tee joint corresponding to the leaking oil circuit. The movement of the pressure reducing component also causes the drain hole on the outer sleeve to open, and the hydraulic oil in the normal oil circuit is discharged through the drain hole.

[0013] In one alternative embodiment, the pressure-reducing assembly includes: a baffle;

[0014] The baffle is disposed inside the outer sleeve, and the outer wall of the baffle is in contact with the inner wall of the outer sleeve;

[0015] The baffle is provided with insert rods corresponding to the through holes on both ends, and the insert rods are adapted to the through holes;

[0016] When both oil lines are functioning normally, the end of the insert rod extends into the corresponding through hole.

[0017] In one optional embodiment, the outer sleeve has a plurality of oil drain holes on its side wall, and the outer wall of the baffle has protrusions corresponding to the oil drain holes, the protrusions being inserted into the corresponding oil drain holes;

[0018] When both oil lines are functioning normally, the baffle is located in the middle of the outer sleeve, and the protrusion is inserted into the corresponding drain hole.

[0019] In one alternative implementation, when one of the oil circuits leaks, the oil pressure in the normal oil circuit is greater than the oil pressure in the leaking oil circuit. The hydraulic oil with higher pressure squeezes the corresponding insert rod in the normal oil circuit, which in turn squeezes the baffle, causing the baffle deformation protrusion to move out of the corresponding drain hole and expose the drain hole.

[0020] In one alternative implementation, the hydraulic oil in the normal oil circuit pushes the baffle closer to the tee joint corresponding to the leaking oil circuit, so that the corresponding insert rod is inserted into the tee joint corresponding to the leaking oil circuit, thereby reducing the communication space between the first end and the second end of the tee joint corresponding to the leaking oil circuit.

[0021] In one alternative implementation, when the baffle moves, the insert rod corresponding to the normal oil circuit moves out of the corresponding through hole and completely enters the outer sleeve. At this time, the hydraulic oil in the normal oil circuit enters the outer sleeve through the through hole and then exits the outer sleeve through the exposed drain hole.

[0022] Secondly, embodiments of this disclosure also provide a fork mast, comprising:

[0023] A pair of lifting cylinders, the lifting cylinders being connected to the aforementioned explosion-proof device for forklift lifting cylinders.

[0024] In one optional embodiment, the telescopic end of the lifting cylinder is connected to the lifting frame, and a fixed frame is provided outside the lifting frame, with the lifting frame and the fixed frame being slidably connected.

[0025] The lifting cylinder is connected to the fixed frame.

[0026] Thirdly, embodiments of this disclosure also provide a forklift, comprising:

[0027] The aforementioned forklift mast.

[0028] Fourthly, this disclosure also provides a method for operating the explosion-proof device for a forklift lifting cylinder described above, comprising:

[0029] When one of the oil circuits leaks, the hydraulic oil in the normal oil circuit pushes the pressure reducing component into the tee joint corresponding to the leaking oil circuit, thereby reducing the communication space between the first and second ends of the tee joint corresponding to the leaking oil circuit. The movement of the pressure reducing component also causes the drain hole on the outer sleeve to open, and the hydraulic oil in the normal oil circuit is discharged through the drain hole.

[0030] The beneficial effect of this invention is that the explosion-proof device for forklift lifting cylinders includes: a pair of three-way connectors, the first end of which is connected to a corresponding oil circuit, the second end of which is connected to a distribution valve, and a connecting mechanism connecting the third ends of the two three-way connectors; the oil circuit is connected to the corresponding lifting cylinder, and hydraulic oil, after being distributed by the distribution valve, enters the corresponding oil circuit through the three-way connector to flow to the lifting cylinder; the connecting mechanism includes: an outer sleeve; both ends of the outer sleeve are connected to the third ends of the corresponding three-way connectors, and both ends of the outer sleeve are provided with through holes. This allows the outer sleeve to connect with two tee connectors. A pressure-reducing component is installed inside the outer sleeve. When one oil circuit leaks, the hydraulic oil in the normal oil circuit pushes the pressure-reducing component into the tee connector corresponding to the leaking oil circuit. This reduces the connection space between the first and second ends of the tee connector corresponding to the leaking oil circuit. The movement of the pressure-reducing component also opens the drain hole on the outer sleeve, allowing the hydraulic oil in the normal oil circuit to drain through the drain hole. This prevents excessive pressure difference between the two lifting cylinders from causing forklift mast distortion and damage when one oil circuit leaks.

[0031] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 A schematic diagram of an explosion-proof device for a forklift lifting cylinder provided in an embodiment of this disclosure;

[0035] Figure 2 A cross-sectional view of an explosion-proof device provided in an embodiment of this disclosure;

[0036] Figure 3 This is a schematic diagram showing the position of a baffle after an oil leak, provided in an embodiment of this disclosure.

[0037] Figure 4 This is a schematic diagram of the structure of an outer sleeve provided in an embodiment of the present disclosure;

[0038] Figure 5 This is a schematic diagram of a pressure-reducing component provided in an embodiment of the present disclosure;

[0039] Figure 6 This is a structural schematic diagram of a forklift mast provided in an embodiment of this disclosure.

[0040] In the picture:

[0041] 1. T-connector; 11. First end; 12. Second end; 13. Third end;

[0042] 2 lifting cylinders;

[0043] 3. Connecting mechanism, 31. Outer sleeve, 311. Oil drain hole, 312. Through hole, 32. Pressure reducing assembly, 321. Baffle, 322. Insert rod, 323. Protrusion;

[0044] 4 lifting frames, 41 fixed frames;

[0045] 5. Distribution valve. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0048] When a forklift lifts an object, the two forks bear different pressures, resulting in different pressures at the corresponding positions of the fork mast and the forks. At this time, the hydraulic oil is distributed through the distribution valve, and the lifting cylinder corresponding to the fork mast that bears the greater pressure will receive a larger oil pressure.

[0049] However, when a leak occurs in the hydraulic circuit connected to one of the lifting cylinders, the oil pressure in that circuit will decrease instantly. This causes the distribution valve to determine that the pressure on the forks corresponding to that circuit has decreased, and the distribution valve will further increase the oil pressure in the other normal hydraulic circuit. At this time, the oil pressure in the lifting cylinder corresponding to the leaking circuit decreases, while the oil pressure in the lifting cylinder corresponding to the normal circuit increases. The pressure difference between the two lifting cylinders further increases, causing the forks in the leaking circuit to descend, while the forks corresponding to the normal circuit remain stationary, resulting in the fork mast being twisted and damaged.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0051] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0052] like Figure 1 and Figure 2As shown, at least one disclosed embodiment provides an explosion-proof device for a forklift lifting cylinder, comprising: a pair of three-way connectors 1, wherein the first end 11 of the three-way connectors 1 is connected to a corresponding oil circuit, the second end 12 is connected to a distribution valve 5, and a connecting mechanism 3 is connected between the third ends 13 of the two three-way connectors 1; the oil circuit is connected to a corresponding lifting cylinder 2, and hydraulic oil, after being distributed by the distribution valve 5, enters the corresponding oil circuit through the three-way connectors 1 to flow to the lifting cylinder 2; the connecting mechanism 3 includes: an outer sleeve 31; both ends of the outer sleeve 31 are connected to the third ends 13 of the corresponding three-way connectors 1, and both ends of the outer sleeve 31 are provided with a passage. Hole 312 is provided to connect the outer sleeve 31 with two three-way connectors 1. A pressure reducing component 32 is provided inside the outer sleeve 31. When one of the oil circuits leaks, the hydraulic oil in the normal oil circuit pushes the pressure reducing component 32 into the three-way connector 1 corresponding to the leaking oil circuit, thereby reducing the communication space between the first end 11 and the second end 12 in the three-way connector 1 corresponding to the leaking oil circuit. The movement of the pressure reducing component 32 causes the drain hole 311 on the outer sleeve 31 to open, and the hydraulic oil in the normal oil circuit is discharged through the drain hole 311. This achieves the goal of avoiding excessive oil pressure difference in the two lifting cylinders 2, which could lead to fork mast twisting and damage when one oil circuit leaks.

[0053] In this embodiment, when one oil circuit leaks, the oil pressure (hydraulic oil pressure) in the corresponding oil circuit will drop rapidly. The conventional distribution valve 5 will reduce the oil pressure in the leaking oil circuit and increase the oil pressure in the normal oil circuit, causing the oil pressure difference between the two lifting cylinders 2 to increase. This leads to rapid changes in the force on the fork mast connected to the lifting cylinder 2, resulting in torsional damage. Therefore, by setting the connecting mechanism 3, when one oil circuit leaks, the oil pressure in the normal oil circuit will be much greater than the oil pressure in the leaking oil circuit. At this time, the hydraulic oil in the normal oil circuit can push the corresponding insert rod 322 to deform the baffle 321. The protrusion 323 on the baffle 321 separates from the drain hole 311, and the baffle 321 can move, thus preventing the leaking oil circuit from leaking. The corresponding insert rod 322 is gradually inserted into the corresponding three-way connector 1, which reduces the communication space between the first end 11 and the second end 12 of the corresponding three-way connector 1. This slows down the rate of decrease in hydraulic oil pressure between the second end 12 of the three-way connector 1 and the distribution valve 5, thereby slowing down the rate of decrease in hydraulic oil pressure in the leakage oil circuit of the distribution valve 5, slowing down the rate of increase in hydraulic oil pressure in the normal oil circuit of the distribution valve 5, and slowing down the rate of increase in the pressure difference between the two lifting cylinders 2. This prevents the pressure difference between the two lifting cylinders 2 from increasing rapidly, and prevents the corresponding lifting cylinder 2 in the leakage oil circuit from losing pressure rapidly and failing to support the normal oil circuit from increasing pressure to stabilize the support, which would lead to uneven stress on the fork mast and twisting damage.

[0054] like Figure 4 and Figure 5As shown, in one optional embodiment, the pressure reducing assembly 32 includes: a baffle 321; the baffle 321 is disposed inside the outer sleeve 31, and the outer wall of the baffle 321 contacts the inner wall of the outer sleeve 31; both ends of the baffle 321 are provided with insert rods 322 corresponding to the through holes 312, and the insert rods 322 are adapted to the through holes 312; when both oil passages are normal, the ends of the insert rods 322 extend into the corresponding through holes 312.

[0055] In this embodiment, the insertion rod 322 is inserted into the through hole 312, and the baffle 321 divides the space inside the outer sleeve 31 into two parts, which can prevent the two T-connectors 1 from connecting.

[0056] like Figure 4 and Figure 5 As shown, in one optional embodiment, the outer sleeve 31 has a plurality of oil drain holes 311 on its side wall, and the outer wall of the baffle 321 is provided with protrusions 323 corresponding to the oil drain holes 311. The protrusions 323 are inserted into the corresponding oil drain holes 311. When both oil passages are normal, the baffle 321 is located in the middle position of the outer sleeve 31, and the protrusions 323 are inserted into the corresponding oil drain holes 311.

[0057] like Figure 2 As shown, in this embodiment, when both oil circuits are normal, the protrusion 323 of the baffle 321 can block the oil drain hole 311, and at this time the oil pressure difference in the two oil circuits cannot push the insert rod 322 to move, thus maintaining the position of the baffle 321 and blocking the oil drain hole 311.

[0058] like Figure 3 As shown, in this embodiment, when an oil circuit leaks, the insert rod 322 corresponding to the normal oil circuit is pushed by the hydraulic oil in the normal oil circuit. At this time, the oil pressure difference between the normal oil circuit and the leaking oil circuit increases, so that the hydraulic oil in the normal oil circuit can push the insert rod 322 to move, causing the baffle 321 to deform and drive the protrusion 323 to move out of the drain hole 311. The drain hole 311 is exposed and opened, and the hydraulic oil in the normal oil circuit enters the outer sleeve 31 and is discharged through the drain hole 311, reducing the oil pressure in the normal oil circuit.

[0059] In one alternative implementation, when one of the oil circuits leaks, the oil pressure in the normal oil circuit is greater than the oil pressure in the leaking oil circuit. The hydraulic oil with higher pressure squeezes the corresponding insert rod 322 of the normal oil circuit, which in turn squeezes the baffle 321, causing the deformed protrusion 323 of the baffle 321 to move out of the corresponding drain hole 311, exposing the drain hole 311.

[0060] like Figure 3As shown, in an optional embodiment, the hydraulic oil in the normal oil circuit pushes the baffle 321 closer to the tee joint 1 corresponding to the leaking oil circuit, so that the corresponding insert rod 322 is inserted into the tee joint 1 corresponding to the leaking oil circuit, thereby reducing the communication space between the first end 11 and the second end 12 in the tee joint 1 corresponding to the leaking oil circuit.

[0061] In one alternative embodiment, when the baffle 321 moves, the insert rod 322 corresponding to the normal oil circuit moves out of the corresponding through hole 312 and completely enters the outer sleeve 31. At this time, the hydraulic oil in the normal oil circuit enters the outer sleeve 31 through the through hole 312 and then exits the outer sleeve 31 through the exposed drain hole 311.

[0062] like Figure 6 As shown, at least one other disclosed embodiment also provides a forklift mast, including: a pair of lifting cylinders 2, the lifting cylinders 2 being connected to the explosion-proof device for forklift lifting cylinders described above.

[0063] In one optional embodiment, the telescopic end of the lifting cylinder 2 is connected to the lifting frame 4, and a fixed frame 41 is provided outside the lifting frame 4, with the lifting frame 4 and the fixed frame 41 being slidably connected; the lifting cylinder 2 is connected to the fixed frame 41.

[0064] At least one other disclosed embodiment also provides a forklift including the fork mast described above.

[0065] At least one other disclosed embodiment also provides a method of operating the explosion-proof device for a forklift lifting cylinder described above, comprising: when one of the oil circuits leaks, the hydraulic oil in the normal oil circuit pushes the pressure reducing component 32 into the tee joint 1 corresponding to the leaking oil circuit, so as to reduce the communication space between the first end 11 and the second end 12 in the tee joint 1 corresponding to the leaking oil circuit, and the movement of the pressure reducing component 32 causes the drain hole 311 opened on the outer sleeve 31 to open, and the hydraulic oil in the normal oil circuit is discharged through the drain hole 311.

[0066] In summary, the explosion-proof device for forklift lifting cylinders includes: a pair of three-way connectors 1, the first end 11 of which is connected to a corresponding oil circuit, the second end 12 of which is connected to a distribution valve 5, and a connecting mechanism 3 connecting the third ends 13 of the two three-way connectors 1; the oil circuit is connected to the corresponding lifting cylinder 2, and hydraulic oil, after being distributed by the distribution valve 5, enters the corresponding oil circuit through the three-way connectors 1 to flow to the lifting cylinder 2; the connecting mechanism 3 includes: an outer sleeve 31; both ends of the outer sleeve 31 are connected to the third ends 13 of the corresponding three-way connectors 1, and both ends of the outer sleeve 31 are provided with through holes 312 to allow for... The outer sleeve 31 is connected to two three-way connectors 1. A pressure reducing component 32 is provided inside the outer sleeve 31. When one of the oil circuits leaks, the hydraulic oil in the normal oil circuit pushes the pressure reducing component 32 into the three-way connector 1 corresponding to the leaking oil circuit, so that the communication space between the first end 11 and the second end 12 in the three-way connector 1 corresponding to the leaking oil circuit is reduced. The movement of the pressure reducing component 32 causes the drain hole 311 opened on the outer sleeve 31 to open. The hydraulic oil in the normal oil circuit is discharged through the drain hole 311, thereby avoiding the fork mast to be twisted and damaged due to excessive oil pressure difference in the two lifting cylinders 2 when one oil circuit leaks.

[0067] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0068] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0069] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0070] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An explosion-proof device for a forklift lifting cylinder, characterized in that, include: A pair of three-way connectors (1), the first end (11) of the three-way connector (1) is connected to the corresponding oil circuit, the second end (12) is connected to the distribution valve (5), and a connecting mechanism (3) is connected between the third ends (13) of the two three-way connectors (1). The oil circuit is connected to the corresponding lifting cylinder (2). After the hydraulic oil is distributed by the distribution valve (5), it enters the corresponding oil circuit through the three-way connector (1) and flows to the lifting cylinder (2). The connecting mechanism (3) includes: an outer sleeve (31); The two ends of the outer sleeve (31) are connected to the third end (13) of the corresponding three-way connector (1). Both ends of the outer sleeve (31) are provided with through holes (312) so that the outer sleeve (31) can communicate with the two three-way connectors (1). A pressure-reducing assembly (32) is provided inside the outer sleeve (31). When one of the oil circuits leaks, the hydraulic oil in the normal oil circuit pushes the pressure-reducing assembly (32) into the tee joint (1) corresponding to the leaking oil circuit, thereby reducing the communication space between the first end (11) and the second end (12) of the tee joint (1) corresponding to the leaking oil circuit. The movement of the pressure-reducing assembly (32) causes the drain hole (311) on the outer sleeve (31) to open, and the hydraulic oil in the normal oil circuit is discharged through the drain hole (311). The outer sleeve (31) has several oil drain holes (311) on its side wall. The outer wall of the baffle (321) in the pressure reducing assembly (32) is provided with a protrusion (323) corresponding to the oil drain hole (311), and the protrusion (323) is inserted into the corresponding oil drain hole (311); When both oil lines are normal, the baffle (321) is located in the middle of the outer sleeve (31), and the protrusion (323) is inserted into the corresponding drain hole (311).

2. The explosion-proof device for a forklift lifting cylinder as described in claim 1, characterized in that, The pressure relief assembly (32) includes: a baffle (321); The baffle (321) is disposed inside the outer sleeve (31), and the outer wall of the baffle (321) is in contact with the inner wall of the outer sleeve (31); The baffle (321) has insert rods (322) corresponding to the through holes (312) on both ends, and the insert rods (322) are adapted to the through holes (312); When both oil circuits are normal, the end of the insert (322) extends into the corresponding through hole (312).

3. The explosion-proof device for a forklift lifting cylinder as described in claim 2, characterized in that, When one of the oil circuits leaks, the oil pressure in the normal oil circuit is greater than the oil pressure in the leaking oil circuit. The hydraulic oil with higher oil pressure squeezes the corresponding insert rod (322) of the normal oil circuit, and then squeezes the baffle (321), causing the deformation protrusion (323) of the baffle (321) to move out of the corresponding drain hole (311) and expose the drain hole (311).

4. The explosion-proof device for a forklift lifting cylinder as described in claim 3, characterized in that, The hydraulic oil in the normal oil circuit pushes the baffle (321) closer to the tee joint (1) corresponding to the leaking oil circuit, so that the corresponding insert (322) is inserted into the tee joint (1) corresponding to the leaking oil circuit, thereby reducing the communication space between the first end (11) and the second end (12) of the tee joint (1) corresponding to the leaking oil circuit.

5. The explosion-proof device for a forklift lifting cylinder as described in claim 4, characterized in that, When the baffle (321) moves, the corresponding insert (322) of the normal oil circuit moves out of the corresponding through hole (312) and completely enters the outer sleeve (31). At this time, the hydraulic oil in the normal oil circuit enters the outer sleeve (31) through the through hole (312) and then exits the outer sleeve (31) through the exposed drain hole (311).

6. A forklift mast, characterized in that, include: A pair of lifting cylinders (2), the lifting cylinders (2) being connected to the explosion-proof device for forklift lifting cylinders as described in claim 1.

7. The forklift mast as described in claim 6, characterized in that, The telescopic end of the lifting cylinder (2) is connected to the lifting frame (4), and a fixed frame (41) is provided outside the lifting frame (4). The lifting frame (4) and the fixed frame (41) are slidably connected. The lifting cylinder (2) is connected to the fixed frame (41).

8. A forklift, characterized in that, include: The forklift mast as described in claim 6.

9. A method for operating the explosion-proof device for a forklift lifting cylinder as described in claim 1, characterized in that, include: When one of the oil circuits leaks, the hydraulic oil in the normal oil circuit pushes the pressure reducing component (32) to insert into the tee joint (1) corresponding to the leaking oil circuit, so that the communication space between the first end (11) and the second end (12) of the tee joint (1) corresponding to the leaking oil circuit is reduced, and the movement of the pressure reducing component (32) causes the drain hole (311) opened on the outer sleeve (31) to be opened, and the hydraulic oil in the normal oil circuit is discharged through the drain hole (311).

Images