Heavy-duty dump truck lifting multi-stage hydraulic cylinder with self-locking function

Abstract

The utility model relates to hydraulic cylinder technical field discloses a heavy duty dump truck hoisting multistage hydraulic cylinder with self -locking function, including hydraulic cylinder body, the oil inlet joint that is connected with the oil inlet pipe is equipped on the hydraulic cylinder body circumference outer wall, the annular lug that uses in cooperation with the oil inlet joint is equipped on the hydraulic cylinder body circumference inner wall, the two symmetrical slide groove that is established in the annular lug, two the slide groove in all slidingly connected with the limit slide block, the one side of limit slide block all is fixedly connected with the connecting rod, the one end of two connecting rod passes through the one side fixed connection of annular lug with the baffle that carries out the blocking of channel in annular lug. The utility model can be when the oil extrusion baffle in the hydraulic cylinder body in the oil inlet pipe burst makes it and the one side of annular lug close contact, and then the oil inlet joint is dead, makes the oil in the inside not to flow out and prevents the telescopic rod contraction of hydraulic cylinder body.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and more specifically to a multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with a self-locking function. Background Technology

[0002] Heavy-duty dump trucks are core transportation equipment in mining, water conservancy, and large-scale infrastructure fields. One of their core functions is to quickly and reliably complete the unloading of goods. This process relies on a powerful lifting system, whose core power component is the lifting hydraulic cylinder. The multi-stage hydraulic cylinder adopts a sleeve structure, with each stage of the cylinder nested in sequence, extending outwards from the inside during operation.

[0003] A search revealed Chinese patent CN207892923U, which discloses a hydraulic cylinder. The device uses a waterproof block to prevent water from entering the cylinder head, thus avoiding water damage to the cylinder head and further ensuring the stability of the hydraulic cylinder. However, when the oil pressure inside the hydraulic cylinder is high, the oil inlet pipe will be subjected to high pressure during the oil injection process, which may easily cause the hydraulic hose to rupture, resulting in a sudden loss of system pressure. If the lifting cylinder does not have a self-locking function, the cargo box will fall rapidly under gravity, posing a safety hazard. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a heavy-duty dump truck lifting multi-stage hydraulic cylinder with self-locking function to solve the problems existing in the background art.

[0005] This utility model provides the following technical solution: a multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with a self-locking function, comprising a hydraulic cylinder body, an oil inlet connector connected to an oil inlet pipe on the outer circumference of the hydraulic cylinder body, and an annular protrusion on the inner circumference of the hydraulic cylinder body for use with the oil inlet connector. Two symmetrical sliding grooves are opened in the annular protrusion, and a limit slider is slidably connected in each of the two sliding grooves. A connecting rod is fixedly connected to one side of each limit slider, and a baffle that blocks the channel inside the annular protrusion is fixedly connected to one end of each connecting rod through one side of the annular protrusion.

[0006] As a further embodiment of this utility model, an end plate is fixedly connected to the top of the piston rod of the hydraulic cylinder body. Two symmetrical top plates are fixedly connected to the outer circumference of the end plate. Two symmetrical connecting plates are bolted to the outer circumference of the top of the hydraulic cylinder body. Both connecting plates have clearance openings. Square rods are slidably connected in both clearance openings. The tops of the two square rods are fixed to the lower surfaces of the two top plates respectively. Multiple pin holes with equal spacing are opened on the outer circumference of the two square rods. A pin block is inserted into one of the pin holes located above the connecting plate.

[0007] As a further embodiment of this utility model, springs are fixedly connected to one side of each of the two limiting sliders, and the other ends of the two springs are respectively fixed to the inner wall of one side of the corresponding slide groove, and the springs are sleeved on the outside of the connecting rod.

[0008] As a further embodiment of this utility model, two rubber sealing rings, one large and one small, are bonded to one side of the baffle, and the two rubber rings are respectively positioned between the two connecting rods and on both sides, thus wrapping the connecting rods.

[0009] As a further embodiment of this utility model, two symmetrical base plates are fixedly connected to the outer circumference of the bottom end of the hydraulic cylinder body, and square tubes that cooperate with square rods are fixedly connected between the upper surface of the two sets of base plates on both sides and the lower surface of the connecting plate.

[0010] As a further embodiment of this utility model, the upper surfaces of both connecting plates are provided with limiting grooves, and the two pins slide within the two limiting grooves respectively.

[0011] As a further embodiment of this utility model, support columns for supporting the connecting plates are fixedly connected between the upper surface of the two sets of base plates and the lower surface of the connecting plates, and on both sides of the square tube.

[0012] The technical effects and advantages of this utility model are as follows:

[0013] 1. This utility model has a connecting rod and a baffle that slide inside the annular protrusion. When the oil inlet pipe bursts, the oil in the hydraulic cylinder body squeezes the baffle so that it comes into close contact with one side of the annular protrusion, thereby blocking the oil inlet joint and preventing the internal oil from flowing out, thus preventing the extension rod of the hydraulic cylinder body from retracting.

[0014] 2. This utility model, through the provided square rod, the pin opening on the square rod, and the pin block inserted into the pin opening, can mechanically lock the telescopic rod of the hydraulic cylinder body, further preventing retraction in case of accidents.

[0015] 3. This utility model, by providing a support column between the connecting plate and the base plate, can support the connecting plate when the telescopic rod is locked, thereby increasing the load-bearing capacity of the connecting plate. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0017] Figure 2 This is a cross-sectional schematic diagram of the hydraulic cylinder body of this utility model.

[0018] Figure 3 This is a cross-sectional view of the annular protrusion of this utility model.

[0019] Figure 4 This utility model Figure 1 An enlarged schematic diagram.

[0020] The attached diagram is labeled as follows: 1. Hydraulic cylinder body; 2. Oil inlet connector; 3. Annular protrusion; 4. Slide groove; 5. Limiting slider; 6. Connecting rod; 7. Baffle; 8. Spring; 9. Rubber sealing ring; 10. Base plate; 11. Connecting plate; 12. Square tube; 13. Square rod; 14. Top plate; 15. Alternating opening; 16. Pin opening; 17. Pin block; 18. Limiting groove; 19. End plate. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Reference Figures 1-4 This utility model provides a multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with a self-locking function, including a hydraulic cylinder body 1. The outer circumference of the hydraulic cylinder body 1 is provided with an oil inlet connector 2 connected to an oil inlet pipe. The inner circumference of the hydraulic cylinder body 1 is provided with an annular protrusion 3 that cooperates with the oil inlet connector 2. Two symmetrical sliding grooves 4 are opened in the annular protrusion 3. Limiting sliders 5 are slidably connected in both sliding grooves 4. A connecting rod 6 is welded to one side of each limiting slider 5. One end of each connecting rod 6 passes through one side of the annular protrusion 3 and is fixedly connected to a baffle 7 that blocks the channel inside the annular protrusion 3 by bolts.

[0023] By providing a connecting rod 6 and a baffle 7 that slide inside the annular protrusion 3, when the oil inlet pipe bursts, the oil in the hydraulic cylinder body 1 squeezes the baffle 7 to make it come into close contact with one side of the annular protrusion 3, thereby blocking the oil inlet connector 2, preventing the internal oil from flowing out and thus preventing the extension rod of the hydraulic cylinder body 1 from retracting.

[0024] Furthermore, springs 8 are welded to one side of each of the two limiting sliders 5, and the other end of each spring 8 is fixed to the inner wall of one side of the corresponding slide groove 4, and the springs 8 are sleeved on the outside of the connecting rod 6.

[0025] Specifically, when using the hydraulic cylinder, first connect the oil inlet connector 2 and the oil outlet connector on it to the oil inlet pipe and the oil outlet pipe respectively. When the oil is inlet, the flowing oil will push the baffle 7 to separate it from one side of the annular protrusion 3. During the movement of the baffle 7, the connecting rod 6 will drive the limiting slider 5 to slide in the slide groove 4. During the sliding process, the limiting slider 5 squeezes the spring 8, causing the spring 8 to be compressed.

[0026] Furthermore, one side of the baffle 7 is bonded with two rubber sealing rings 9, one large and one small, and the two rubber sealing rings 9 are respectively positioned between the two connecting rods 6 and on both sides, thus wrapping the connecting rods 6.

[0027] Specifically, after the oil filling is completed, the spring 8 releases its elastic force to push the limit slider 5, causing the limit slider 5 to move in the opposite direction along the slide groove 4. This, in turn, pulls the baffle 7 in the opposite direction through the connecting rod 6 until the rubber sealing ring 9 on one side of the baffle 7 fits against the side of the annular protrusion 3. This prevents the oil in the hydraulic cylinder body 1 from flowing out and causing the hydraulic cylinder body 1 to contract in the event of a burst in the oil inlet pipe.

[0028] In this utility model, the piston rod of the hydraulic cylinder body 1 is fixedly connected to an end plate 19 by bolts. Two symmetrical top plates 14 are fixedly connected to the outer circumference of the end plate 19 by bolts. Two symmetrical connecting plates 11 are connected to the outer circumference of the top of the hydraulic cylinder body 1 by bolts. Both connecting plates 11 have a relief opening 15. A square rod 13 is slidably connected in both relief openings 15. The top ends of the two square rods 13 are fixed to the lower surfaces of the two top plates 14 respectively. Multiple pin holes 16 with the same spacing are opened on the outer circumference of both square rods 13. A pin block 17 is inserted into one of the pin holes 16 located above the connecting plate 11.

[0029] The hydraulic cylinder body 1 telescopic rod can be mechanically locked by the provided square rod 13, the pin opening 16 on the square rod 13, and the pin block 17 inserted into the pin opening 16, further preventing retraction in case of accidents.

[0030] Furthermore, the upper surfaces of the two connecting plates 11 are provided with limiting grooves 18, and the two pins 17 slide in the two limiting grooves 18 respectively.

[0031] Specifically, before the hydraulic cylinder body 1 extends, the pin block 17 is pulled out first. Then, during the extension process, the square rod 13 will move upward along the relief opening 15 through the top plate 14. After the hydraulic cylinder body 1 extends to the required position, the pin block 17 is reinserted into the pin opening 16 near the upper surface of the connecting plate 11 so that the square rod 13 can support the piston rod of the hydraulic cylinder body 1 through the top plate 14, further ensuring that it will not retract.

[0032] In this utility model, two symmetrical base plates 10 are fixedly connected to the outer circumference of the bottom end of the hydraulic cylinder body 1 by bolts. The upper surfaces of the two sets of base plates 10 on both sides and the lower surfaces of the connecting plate 11 are fixedly connected by bolts to square tubes 12 that cooperate with square rods 13.

[0033] Furthermore, the upper surfaces of the two sets of base plates 10 and the lower surfaces of the connecting plates 11 are fixedly connected with support columns by bolts on both sides of the square tube 12 to support the connecting plates 11.

[0034] This utility model, by providing a support column between the connecting plate 11 and the base plate 10, can support the connecting plate 11 when the telescopic rod is locked, thereby increasing the load-bearing capacity of the connecting plate 11.

[0035] The use of this utility model involves the following steps:

[0036] S1: When using the hydraulic cylinder, first connect the oil inlet connector 2 and the oil outlet connector on it to the oil inlet pipe and the oil outlet pipe respectively. When the oil is inlet, the flowing oil will push the baffle 7 to separate it from one side of the annular protrusion 3. During the movement of the baffle 7, the connecting rod 6 will drive the limiting slider 5 to slide in the slide groove 4. During the sliding process, the limiting slider 5 squeezes the spring 8, causing the spring 8 to be compressed by force.

[0037] S2: After the oil filling is completed, the spring 8 releases its elastic force to push the limit slider 5, so that the limit slider 5 moves in the opposite direction along the slide groove 4 and pulls the baffle 7 in the opposite direction through the connecting rod 6 until the rubber sealing ring 9 on one side of the baffle 7 fits with one side of the annular protrusion 3, thereby preventing the oil in the hydraulic cylinder body 1 from flowing out when the oil inlet pipe bursts, causing the hydraulic cylinder body 1 to contract.

[0038] S3: Before the hydraulic cylinder body 1 extends, first pull out the pin 17. Then, during the extension process, the square rod 13 will move upward along the relief opening 15 through the top plate 14. After the hydraulic cylinder body 1 extends to the required position, the pin 17 is reinserted into the pin opening 16 near the upper surface of the connecting plate 11 so that the square rod 13 can support the piston rod of the hydraulic cylinder body 1 through the top plate 14, further ensuring that it will not retract.

[0039] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0040] The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs.

[0041] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with self-locking function, comprising a hydraulic cylinder body (1), characterized in that: The hydraulic cylinder body (1) has an oil inlet connector (2) connected to the oil inlet pipe on its outer circumference. The hydraulic cylinder body (1) has an annular protrusion (3) that works with the oil inlet connector (2) on its inner circumference. The annular protrusion (3) has two symmetrical grooves (4) inside. The two grooves (4) are slidably connected to a limit slider (5). The limit slider (5) is fixedly connected to one side of each side. One end of the two connecting rods (6) passes through the annular protrusion (3) and is fixedly connected to a baffle (7) that blocks the channel inside the annular protrusion (3).

2. The multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with self-locking function according to claim 1, characterized in that: The piston rod of the hydraulic cylinder body (1) is fixedly connected to an end plate (19). Two symmetrical top plates (14) are fixedly connected to the outer circumference of the end plate (19). Two symmetrical connecting plates (11) are bolted to the outer circumference of the top of the hydraulic cylinder body (1). Both connecting plates (11) have a clearance opening (15). A square rod (13) is slidably connected in both clearance openings (15). The top ends of the two square rods (13) are fixed to the lower surfaces of the two top plates (14). Multiple pin holes (16) with the same spacing are opened on the outer circumference of the two square rods (13). A pin block (17) is inserted into one of the pin holes (16) located above the connecting plate (11).

3. A multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with self-locking function as described in claim 1, characterized in that: One side of each of the two limiting sliders (5) is fixedly connected with a spring (8), and the other end of each of the two springs (8) is fixed to the inner wall of one side of the corresponding slide groove (4), and the spring (8) is sleeved on the outside of the connecting rod (6).

4. A multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with self-locking function as described in claim 1, characterized in that: Two rubber sealing rings (9), one large and one small, are bonded to one side of the baffle (7). The two rubber rings (9) are respectively positioned between the two connecting rods (6) and on both sides, and wrap around the connecting rods (6).

5. A multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with self-locking function according to claim 2, characterized in that: Two symmetrical base plates (10) are fixedly connected to the outer wall of the bottom circumference of the hydraulic cylinder body (1). The upper surface of the two sets of base plates (10) on both sides and the lower surface of the connecting plate (11) are fixedly connected to square tubes (12) that cooperate with square rods (13).

6. A multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with self-locking function according to claim 2, characterized in that: The upper surfaces of the two connecting plates (11) are provided with limiting grooves (18), and the two pins (17) slide in the two limiting grooves (18) respectively.

7. A multi-stage hydraulic cylinder for lifting heavy-duty dump trucks with self-locking function according to claim 5, characterized in that: Both sets of base plates (10) have support columns fixedly connected between the upper surface of the base plate (10) and the lower surface of the connecting plate (11) and on both sides of the square tube (12) to support the connecting plate (11).

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