An explosion-proof hydraulic system and a side tipping carriage using the same

Abstract

The present application relates to the technical field of explosion-proof hydraulic, disclose a kind of explosion-proof hydraulic system and the lateral tilting carriage of the system application, wherein one kind of explosion-proof hydraulic system, including cylinder barrel, further include the rod group of sliding connection in the inside of cylinder barrel, and the inner rod of sliding connection in the inside of rod group, sliding rod and tertiary rod are connected with spring rod, sliding rod includes initial position and set position, sliding rod is located in initial, tertiary rod does not intercommunicate with inner rod, simultaneously by pressure piece, inner rod is fixed, sliding rod is located in set position, tertiary rod intercommunicates with inner rod.Sliding rod cooperates inner wall inner groove, so that sliding rod, shell and pressure piece and other components work together, form stable control structure, when sliding rod is located in initial, tertiary rod does not intercommunicate with inner rod, simultaneously by pressure piece, inner rod is fixed, and when sliding rod moves to set position, tertiary rod intercommunicates with inner rod, realize accurate telescopic action, hydraulic oil is according to predetermined order to promote each level rod body to stretch out and draw back, effectively avoid telescopic order disorder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosion-proof hydraulic, in particular to an explosion-proof hydraulic system and a lateral tipping carriage applying the same. BACKGROUND

[0002] The multi-stage hydraulic system, also known as telescopic hydraulic cylinder, is composed of multiple cylinder sleeves with different diameters, similar to a sleeve structure, and contains multiple independent telescopic piston assemblies in the inside, each piston assembly corresponds to a stage cylinder, and when working, hydraulic oil enters the oil cylinder to push the piston to extend or retract step by step to realize multi-stage telescopic action. The multi-stage oil cylinder is widely used in mechanical equipment such as dump trucks, cranes and aerial work platforms.

[0003] However, in the prior art, the oil liquid often pushes the next piston prematurely when the first piston has not fully expanded, causing the sequence of each stage of the oil cylinder to be disordered and unable to complete the work process according to the predetermined logic. Usually, in the case of good oil cylinder sealing, the main reason is that if the load changes suddenly during the working process of the multi-stage oil cylinder, for example, the load borne by the first stage oil cylinder suddenly decreases, while the load of other stages of the oil cylinder is relatively large, then when the oil is fed, the first stage oil cylinder may move quickly due to the decrease in load, causing the no-rod cavity pressure to drop rapidly. At this time, if the pressure compensation device in the system cannot be adjusted in time, it is impossible to accurately control the flow direction and pressure distribution of the oil liquid, so that the oil liquid is diverted due to pressure when the first stage push rod is fully expanded. At this time, the oil liquid produces stringing, preferentially flows to the next stage of the oil cylinder with relatively high pressure, thereby causing the disorder phenomenon. Secondly, the first stage oil cylinder inlet pipeline may be blocked by foreign matter, or the pipeline may be bent, flattened or otherwise causing poor oil flow, which may slow down the oil feeding speed of the first stage oil cylinder and excessively prolong the oil feeding time. In this case, the system pressure may gradually rise, and when the pressure is high enough to overcome the resistance of the next stage oil cylinder, the oil liquid will directly enter the next stage oil cylinder, while the first stage oil cylinder may not be filled with oil liquid, thereby causing stringing and disorder. Currently, a filter screen is used for filtering and maintenance of the filter screen is required, but this requires frequent maintenance by the operator, and if neglected, the oil cylinder may be disordered, the load may be insufficient, and the cylinder may burst. Non-sequential push rod extension and retraction may cause abnormal stress on mechanical arms, lifting platforms and other components, accelerate the fatigue damage of key components, and significantly reduce work efficiency. SUMMARY

[0004] The present application aims to provide an explosion-proof hydraulic system and a lateral tipping carriage applying the same, which solves the problem of explosion-proof hydraulic stringing disorder.

[0005] In one aspect of the present application, an explosion-proof hydraulic system is provided, comprising a cylinder, a rod group slidingly connected inside the cylinder, and an inner rod slidingly connected inside the rod group.

[0006] The rod group comprises a first-stage rod slidingly connected inside the cylinder, a second-stage rod slidingly connected inside the first-stage rod, and a third-stage rod slidingly connected inside the second-stage rod, the first-stage rod, the second-stage rod, and the third-stage rod have the same internal structure but gradually decreasing diameters, and the inner wall of the cylinder, the first-stage rod, and the second-stage rod is provided with an inner groove.

[0007] The third-stage rod is slidingly connected with a sliding rod inside, the third-stage rod is provided with a sleeve inside, the sleeve is slidingly connected with a pressing piece inside, the sliding rod and the third-stage rod are connected with a spring rod, the sliding rod comprises an initial position and a set position, when the sliding rod is located at the initial position, the third-stage rod is not in communication with the inner rod, and the inner rod is fixed by the pressing piece, and when the sliding rod is located at the set position, the third-stage rod is in communication with the inner rod.

[0008] Further, the third-stage rod is provided with a liquid flow hole at the center, the bottom end of the third-stage rod is provided with a semicircular groove, the bottom end of the third-stage rod and the inner rod is provided with a mounting groove, the inside of the third-stage rod is provided with a sliding groove, the sliding rod is located inside the sliding groove, and the inside of the mounting groove is fixedly connected with a locking sleeve.

[0009] Further, the sliding rod is provided with a through hole and a semicircular groove, the through hole has the same size as the liquid flow hole, the end of the sliding rod away from the spring rod is arc-shaped, the end is attached to the inner groove when the sliding rod is located at the set position, the liquid flow hole is concentric with the through hole, and the two sides of the semicircular groove are arc-shaped.

[0010] Further, the pressing piece comprises a pressing rod slidingly connected inside the sleeve and a plurality of steel balls placed on the top of the pressing rod, the top of the sleeve is provided with a limiting ring, and the limiting ring is located above the steel balls and attached to the steel balls.

[0011] Further, the sleeve and the pressing rod are connected with a return spring, and when the sliding rod is located at the initial position, the sleeve is located inside the locking sleeve.

[0012] Further, when the sliding rod is located at the initial position, the horizontal distance from the center of the liquid flow hole to the center of the through hole is equal to the horizontal distance from one end of the sliding rod to the inner end point of the inner groove, and is equal to the distance between the center line of the semicircular groove and the center line of the pressing rod.

[0013] Further, the bottom of the inner groove is provided with a downwardly inclined slope, and the top of the inner groove is a horizontal surface.

[0014] Further, a plurality of reinforcing holes are equally arranged in the sleeve and the locking sleeve, the number of the reinforcing holes is the same as that of the steel balls, and when the sliding rod is located at the initial position, half of the steel balls are located inside the corresponding reinforcing holes.

[0015] Further, the bottom end of the pressing rod is provided with an arc shape, and the top end of the pressing rod is a sphere.

[0016] The side tipping carriage further comprises an explosion-proof hydraulic system, a carriage frame, and a carriage body rotatably connected to the top of the carriage frame, wherein the carriage frame is rotatably connected to the top of the inner rod, and the carriage body is rotatably connected to the cylinder barrel.

[0017] The present application has the following advantages:

[0018] The sliding rod, the sleeve, and the pressing piece work together to form a stable control structure. When the sliding rod is in the initial position, the three-stage rod does not communicate with the inner rod, and the pressing piece fixes the inner rod, effectively preventing the oil from entering the inner rod too early and causing the telescopic rod to malfunction. When the sliding rod moves to the set position, the three-stage rod communicates with the inner rod, enabling precise telescopic operation. The hydraulic oil pushes each stage of the rod to extend and retract in a predetermined order, effectively preventing telescopic disorder and achieving strong explosion-proof effect.

[0019] The oil pushes the sliding rod to uniformly transmit force, controls the pressing piece, and controls the movement of the inner rod, enhancing the structural strength and reliability of the system, reducing maintenance requirements, eliminating the need for complex electronic system maintenance, ensuring that each stage of the rod extends and retracts in strict accordance with the predetermined logic, and effectively preventing out-of-order phenomena caused by sudden load changes or pipeline abnormalities.

[0020] By uniformly setting the internal structures of each stage of the rod and only adjusting the sizes of the corresponding components, the components have high universality, the sleeve and the pressing piece do not need to be adjusted in size, and can be produced uniformly, reducing the increase in cost caused by customized production. In addition, when a damaged internal component of a rod is replaced, the same structure component can be quickly replaced without waiting for the production of customized components, improving equipment maintenance efficiency and reducing downtime. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A state diagram of the carriage body when it is tilted according to the present application;

[0022] Figure 2 A structural schematic diagram of the side tipping carriage according to the present application;

[0023] Figure 3 A structural schematic diagram of the cylinder barrel of the explosion-proof hydraulic system according to the present application;

[0024] Figure 4 A top view of the cylinder barrel of the explosion-proof hydraulic system according to the present application;

[0025] Figure 5 A cross-sectional view of the explosion-proof hydraulic system according to the present application at A-A; Figure 4

[0026] ​Figure 6 Figure 3 is a partial sectional view of the third rod of the explosion-proof hydraulic system of the present application;

[0027] Figure 7 Figure 4 is a structural schematic view of the sliding rod of the explosion-proof hydraulic system of the present application;

[0028] Figure 8 Figure 5 is a sectional view of the sleeve of the explosion-proof hydraulic system of the present application;

[0029] Figure 9 Figure 6 is a schematic view of the explosion-proof hydraulic system of the present application Figure 5 Figure 7 is an enlarged schematic view of the middle B of Figure 6;

[0030] Figure 10 Figure 8 is a state diagram of the sliding rod of the explosion-proof hydraulic system of the present application when located at the set position.

[0031] In the figure:

[0032] 1, frame; 2, compartment; 3, cylinder; 4, rod group; 41, first rod; 42, second rod; 43, third rod; 5, inner rod; 6, inner groove; 61, inner end point; 7, sliding rod; 71, through hole; 72, semicircular groove; 8, sleeve; 81, limiting ring; 82, return spring; 9, pressing piece; 91, pressing rod; 92, steel ball; 10, spring rod; 11, locking sleeve; 12, reinforcing hole; 101, liquid flow hole; 102, semicircular groove; 103, mounting groove; 104, sliding groove opening. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0034] Example 1, refer to Figures 1-10 , the first embodiment of the present application provides an explosion-proof hydraulic system, including cylinder 3, also includes slidingly connected in the cylinder 3 inside the rod group 4, and slidingly connected in the rod group 4 inside the inner rod 5, the rod group 4 includes slidingly connected in the cylinder 3 inside the first rod 41, slidingly connected in the first rod 41 inside the second rod 42, and slidingly connected in the second rod 42 inside the third rod 43, forming a nested structure, the first rod 41, the second rod 42 and the third rod 43 have the same internal structure, but the diameter gradually decreases, the inner wall of the cylinder 3, the first rod 41 and the second rod 42 is provided with an inner groove 6, the third rod 43 is slidingly connected with a sliding rod 7 in the inside, the third rod 43 is provided with a sleeve 8 in the inside, the sleeve 8 is slidingly connected with a pressing piece 9 in the inside, the sliding rod 7 and the third rod 43 are connected with a spring rod 10, the sliding rod 7 includes an initial position and a set position, when the sliding rod 7 is located at the initial position, the third rod 43 is not communicated with the inner rod 5, at the same time, the inner rod 5 is fixed by the pressing piece 9, when the sliding rod 7 is located at the set position, the third rod 43 is communicated with the inner rod 5.

[0035] It can be understood that the cylinder 3 is provided with two pipelines respectively undertaking the functions of oil inlet and oil return. Through the circulation of oil inlet and oil return, the hydraulic system can continuously provide power for the multi-stage hydraulic cylinder to ensure the continuous extension and retraction of the multi-stage hydraulic cylinder.

[0036] It is worth noting that the first-stage rod 41, the second-stage rod 42 and the third-stage rod 43 have the same internal structure, and are all provided with the sliding rod 7, the sleeve 8, the pressing piece 9 and the spring rod 10. However, since the diameters of the first-stage rod 41, the second-stage rod 42 and the third-stage rod 43 gradually decrease, the sizes of the corresponding installed parts are also accurately adjusted. The sizes of the sleeve 8 and the pressing piece 9 are not adjusted, and the third-stage rod 43 is not provided with the inner groove 6.

[0037] Specifically, the sliding rod 7 includes two states of an initial position and a set position. When the sliding rod 7 is located at the initial position, the third-stage rod 43 does not communicate with the inner rod 5. At this time, the pressing piece 9 in the sleeve 8 firmly fixes the inner rod 5, preventing the oil from entering the inner rod 5 in advance to cause disorder of the extension and retraction sequence. When the sliding rod 7 moves to the set position under the action of the hydraulic oil pressure, the third-stage rod 43 gradually communicates with the inner rod 5, and the oil enters the next rod body, thereby realizing the orderly extension and retraction of the rod bodies, effectively avoiding the problems of oil mixing and disorder of the extension and retraction sequence. Therefore, if the second-stage rod 42 is extended and retracted at this time, the sliding rod 7 in the second-stage rod 42 also includes two states of an initial position and a set position, thereby ensuring that the equipment strictly extends and retracts according to the sequence.

[0038] With reference to Figures 3-6 , the third-stage rod 43 is provided with a liquid flow hole 101 at the center thereof, the bottom end of the third-stage rod 43 is provided with a semicircular groove 102, the bottom ends of the third-stage rod 43 and the inner rod 5 are provided with mounting grooves 103, the inner portion of the third-stage rod 43 is provided with a sliding groove 104, the sliding rod 7 is located in the sliding groove 104, and the mounting groove 103 is fixedly connected with a locking sleeve 11. The pressing piece 9 fixes the corresponding parts by the fixed locking sleeve 11. Since the bottom portion of the inner rod 5 is also provided with the mounting groove 103, the locking sleeve 11 is also arranged in the inner portion, so that the pressing piece 9 can also fix the inner rod 5.

[0039] Specifically, the sliding groove 104 in the third-stage rod 43 provides guidance for the movement of the sliding rod 7, and the widths of the sliding groove 104 and the sliding rod 7 are the same, so that the sliding rod 7 can flexibly slide therein without shaking, thereby realizing the control of the pressing piece 9. Meanwhile, the spring rod 10 is located in the semicircular groove 102. When the sliding rod 7 is located at the initial position, one side of the bottom surface of the sliding rod 7 is located in the semicircular groove 102, and the oil enters the semicircular groove 102. When the sliding rod 7 can move, the oil will press the sliding rod 7 and stretch the spring rod 10.

[0040] With reference to Figures 3-7The sliding rod 7 is provided with a through hole 71 and a semicircular groove 72, the through hole 71 is the same size as the flow hole 101, the end of the sliding rod 7 away from the spring rod 10 is arc-shaped, and the end is attached to the inner groove 6 when the sliding rod 7 is in a set position, and the flow hole 101 is concentric with the through hole 71, and the two sides of the semicircular groove 72 are arc-shaped.

[0041] Specifically, when the three-stage rod 43 moves upward, the sliding rod 7 gradually approaches the inner groove 6, and the two are finally in the same horizontal line, and the sliding rod 7 has a moving space at this time, and moves under the action of hydraulic oil pressure, and the end of the sliding rod 7 away from the spring rod 10 will gradually embed into the inner groove 6, at this time the through hole 71 also synchronously and continuously approaches the flow hole 101, and the two gradually coincide, and the oil will continuously enter the bottom end of the inner rod 5, thereby avoiding two different passages, rapid coincidence, and causing excessive impact, and the height of the flow hole 101 is less than that of the through hole 71, further reducing the impact, and at this time the inner rod 5 is still fixed by the pressing piece 9, when the end of the sliding rod 7 is attached to the inner end point 61 of the inner groove 6, the pressing piece 9 will simultaneously release the locking of the inner rod 5, and then the oil will flow smoothly into the lower part of the inner rod 5 to push the next-stage piston rod.

[0042] In addition, the end of the sliding rod 7 away from the spring rod 10 is arc-shaped, that is, the end is the arc-shaped end of the sliding rod 7, and the end is attached to the inner groove 6 when the sliding rod 7 is in a set position, and the end is completely attached to the inside of the inner groove 6 except the bottom, to ensure sufficient stability.

[0043] Referring to Figures 3-8 The pressing piece 9 includes a pressing rod 91 slidingly connected inside the sleeve 8, and a plurality of steel balls 92 placed on the top of the pressing rod 91, and the sleeve 8 is provided with a limiting ring 81 on the top, and the limiting ring 81 is located above the steel balls 92 and attached thereto.

[0044] Specifically, the pressing rod 91, the limiting ring 81 and the sleeve 8 are all made of high-strength corrosion-resistant materials, the bottom of the limiting ring 81 limits the steel balls 92, and the pressing rod 91 can limit the bottom of the steel balls 92, so that the steel balls 92 are located between the limiting ring 81 and the pressing rod 91, preventing the steel balls 92 from deviating or falling off during the movement of the pressing rod 91.

[0045] Referring to Figures 3-8 A return spring 82 is connected between the sleeve 8 and the pressing rod 91, the sleeve 8 is located inside the locking sleeve 11 when the sliding rod 7 is in an initial position, and at this time the return spring 82 is in a stretched state.

[0046] Referring to Figures 3-8, the horizontal distance between the center of the flow hole 101 and the center of the through hole 71 is equal to the horizontal distance between one end of the sliding rod 7 and the inner end point 61 of the inner groove 6, and is equal to the distance between the center line of the semicircular groove 72 and the center line of the pressing rod 91, all of which are horizontal distances. For example, at this time, the inner groove 6 is above the sliding rod 7, but the distance between the two is the horizontal distance between them as viewed from the horizontal angle.

[0047] When the sliding rod 7 is not in the set position, that is, when one end of the sliding rod 7 is not in contact with the inner end point 61 of the inner groove 6, the sliding rod 7 will always press the pressing rod 91, so that the return spring 82 is in a stretched state. In addition, due to the arc-shaped end of the sliding rod 7, which is completely fitted inside the inner groove 6 except for the bottom, the shape of the sliding rod 7 at the end is the same as that of the inner groove 6 except for the bottom. Since the end of the sliding rod 7 is arc-shaped, it can be understood that this end is the end closest to the inner end point of the inner groove 6, and the corresponding inner groove 6 is also arc-shaped. Therefore, the inner end point 61 of the inner groove 6 refers to the position farthest from the sliding rod 7 when the sliding rod 7 is in the initial position, which is called the inner end point 61. In addition, since the sizes of the sliding rods 7 inside the first-stage rod 41, the second-stage rod 42, and the third-stage rod 43 are different, the sizes of the corresponding inner grooves 6 are also one-to-one corresponding.

[0048] Specifically, the distance between the center of the flow hole 101 and the center of the through hole 71 is equal to the distance between one end of the sliding rod 7 and the inner end point 61 of the inner groove 6, which ensures that when the sliding rod 7 moves from the initial position to the set position, the flow hole 101 and the through hole 71 can be precisely concentrically aligned when the end of the sliding rod 7 touches the inner end point 61 of the inner groove 6, so that the hydraulic oil can smoothly flow from the third-stage rod 43 through the flow hole 101 and the through hole 71 to the bottom end of the inner rod 5, and at the same time the pressing rod 91 will enter the semicircular groove 72, thereby releasing the locking of the inner rod 5, ensuring the accuracy and stability of oil transmission during the multi-stage telescopic process, and thus achieving precise control of the telescopic action of each stage rod.

[0049] Referring to Figures 3-8 The bottom of the inner groove 6 is provided with a downwardly inclined slope, the top of the inner groove 6 is a horizontal surface, and the top of the sliding rod 7 can be fitted with the horizontal surface.

[0050] Specifically, the end of the sliding rod 7 close to the inner groove 6 is provided with an arc surface, which ensures that during the movement of the sliding rod 7 with the third-stage rod 43, the arc surface of the sliding rod 7 will be pressed and contracted by the slope of the inner groove 6, and at the same time the sliding rod 7 will have a moving space when it reaches the slope position of the inner groove 6, thereby generating movement so that the through hole 71 will gradually become concentric with the flow hole 101, avoiding sudden impact.

[0051] In addition, the spring rod 10 is not used as a component for moving back the sliding rod 7, when the oil impacts the sliding rod 7, one end of the sliding rod 7 cannot move because it is not coincided with the inner groove 6, but when the two are coincided, the oil will immediately impact the sliding rod 7, which is easy to cause damage to the internal structure, and then the spring rod 10 is used to slow down the impact, and can assist the moving back of the sliding rod 7.

[0052] With reference to Figures 3-8 The sleeve 8 and the locking sleeve 11 are both provided with a plurality of reinforcing holes 12 at equal intervals, the edges of the reinforcing holes 12 are arc-shaped, the number of the reinforcing holes 12 is the same as that of the steel balls 92, when the sliding rod 7 is located at the initial position, half of the steel balls 92 are located inside the corresponding reinforcing holes 12, the pressure of the pressing rod 91 is applied to the steel balls 92, and then the steel balls 92 are used to fix the locking sleeve 11, so that the corresponding fixedly connected components are locked, for example, the inner rod 5, when the pressing rod 91 moves downward, at this time, the steel balls 92 are unlocked, the oil at the bottom of the inner rod 5 pushes the inner rod 5 to move, and the locking sleeve 11 moves synchronously, and the other half of the steel balls 92 is always located inside the sleeve 8, and then the steel balls 92 are pressed to move back when the locking sleeve 11 moves, at this time, the inner rod 5 will not be locked, and the steel balls 92 can reduce the linkage of components, so that the components are better used in a closed environment, and the components can also be fixed by using a similar connecting rod structure, and the locking is ensured to be sufficient.

[0053] With reference to Figures 3-8 The two sides of the bottom end of the pressing rod 91 are arc-shaped, and the top end of the pressing rod 91 is a sphere.

[0054] Specifically, when the pressing rod 91 is located inside the semicircular groove 72, the two sides of the semicircular groove 72 are arc-shaped, so that the pressing rod 91 can move away from the inside of the semicircular groove 72, and the top end of the pressing rod 91 is a sphere, which can better extrude the steel balls 92.

[0055] Embodiment 2, with reference to Figures 1-10 This is a second embodiment of the application, which provides a lateral tilting carriage, comprising an explosion-proof hydraulic system, a vehicle frame 1, a carriage body 2 rotatably connected to the top of the vehicle frame 1, the vehicle frame 1 is rotatably connected to the top of the inner rod 5, and the carriage body 2 is rotatably connected to the cylinder barrel 3.

[0056] The working principle of the application is as follows: through the cylinder barrel 3, the first lever 41, the second lever 42, the third lever 43 and the inner rod 5, the carriage body 2 is laterally inclined, and when the first lever 41, the second lever 42, the third lever 43 and the inner rod 5 are extended or retracted, they have the same operation mode, which is exemplified by the third lever 43.

[0057] At this time, the slide rod 7 is in the initial position, the tertiary lever 43 does not communicate with the inner lever 5, the sleeve 8 is inside the locking sleeve 11, the return spring 82 between the sleeve 8 and the pressing rod 91 is in the stretched state, and the pressing rod 91 firmly fixes the inner lever 5 through the steel ball 92 to prevent the inner lever 5 from being pushed by the oil in advance. At this time, the tertiary lever 43 moves upward, the internal components of the tertiary lever 43 move synchronously, and the slide rod 7 inside the tertiary lever 43 gradually approaches the inner groove 6 as the tertiary lever 43 gradually moves upward under the action of the oil pressure. When the tertiary lever 43 gradually coincides with the inner groove 6, the slide rod 7 obtains a moving space, and the oil is pressed from the semi-arc groove 102 to the slide rod 7. Under the action of the hydraulic oil pressure, the slide rod 7 starts to move, and the arc-shaped end thereof away from the spring rod 10 gradually embeds into the inner groove 6. When the slide rod 7 touches the inner end point 61 of the inner groove 6, the flow hole 101 is concentrically aligned with the through hole 71, and the semi-circular groove 72 on the slide rod 7 also makes the pressing rod 91 enter the semi-circular groove 72. The return spring 82 releases part of the stretching force, and the pressing rod 91 releases the locking of the inner lever 5. At this time, the hydraulic oil flows from the tertiary lever 43 to the inner lever 5 through the flow hole 101 and the through hole 71, pushes the inner lever 5 to extend, and realizes the orderly extension and contraction of the levers.

[0058] When the system is retracted, the hydraulic oil flows reversely through the oil return pipeline. First, the inner lever 5 is retracted under the action of the oil pressure, and the locking sleeve 11 at the bottom end of the inner lever 5 is again combined with the sleeve 8. At this time, the slide rod 7 starts to move back under the assistance of the spring rod 10 and the extrusion of the inner groove 6 on the arc surface thereof. The through hole 71 gradually separates from the flow hole 101, and the pressing rod 91 leaves the semi-circular groove 72. The pressing rod 91 moves upward under the extrusion of the top of the slide rod 7 and re-exerts pressure on the steel ball 92, so that the locking sleeve 11 is fixed through the steel ball 92, and the inner lever 5 is also fixed.

[0059] Subsequently, the oil makes the tertiary lever 43, the secondary lever 42 and the primary lever 41 sequentially retract in order. In the retraction process, the components are reset, and the system returns to the initial state and waits for the next work instruction.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. An explosion-proof hydraulic system, comprising a cylinder (3), characterized in that: It also includes a rod assembly (4) that is slidably connected inside the cylinder (3), and an inner rod (5) that is slidably connected inside the rod assembly (4). The rod assembly (4) includes a first-stage rod (41) slidably connected inside the cylinder (3), a second-stage rod (42) slidably connected inside the first-stage rod (41), and a third-stage rod (43) slidably connected inside the second-stage rod (42). The first-stage rod (41), the second-stage rod (42), and the third-stage rod (43) have the same internal structure, but their diameters gradually decrease. The inner walls of the cylinder (3), the first-stage rod (41), and the second-stage rod (42) are provided with inner grooves (6). The three-stage rod (43) is internally connected to a sliding rod (7), and a sleeve (8) is provided inside the three-stage rod (43). A pressure member (9) is internally connected to the sleeve (8). A spring rod (10) is connected between the sliding rod (7) and the three-stage rod (43). The sliding rod (7) includes an initial position and a set position. When the sliding rod (7) is in the initial position, the three-stage rod (43) is not interconnected with the inner rod (5), and the inner rod (5) is fixed by the pressure member (9). When the sliding rod (7) is in the set position, the three-stage rod (43) is interconnected with the inner rod (5). A flow hole (101) is provided at the center of the three-stage rod (43), a semi-arc groove (102) is provided at the bottom end of the three-stage rod (43), and an installation groove (103) is provided at the bottom end of both the three-stage rod (43) and the inner rod (5). A sliding groove (104) is provided inside the three-stage rod (43), and the sliding rod (7) is located inside the sliding groove (104). A locking sleeve (11) is fixedly connected inside the installation groove (103). The slide rod (7) is provided with a through hole (71) and a semi-circular groove (72). The through hole (71) is the same size as the flow hole (101). The end of the slide rod (7) away from the spring rod (10) is arc-shaped. When the slide rod (7) is in the set position, this end is in contact with the inner groove (6), and the flow hole (101) is concentric with the through hole (71). The two sides of the semi-circular groove (72) are set to be arc-shaped. The height of the flow hole (101) is less than that of the through hole (71). The pressure member (9) includes a pressure rod (91) slidably connected inside the housing (8), and multiple steel balls (92) placed on top of the pressure rod (91). A limiting ring (81) is provided on the top of the housing (8), and the limiting ring (81) is located above the steel balls (92) and the two are in contact. A return spring (82) is connected between the sleeve (8) and the pressure rod (91). When the slide rod (7) is in the initial position, the sleeve (8) is located inside the locking sleeve (11).

2. The explosion-proof hydraulic system according to claim 1, characterized in that: When the slide bar (7) is in the initial position, the horizontal distance from the center of the flow hole (101) to the center of the through hole (71) is equal to the horizontal distance from one end of the slide bar (7) to the inner end point (61) of the inner groove (6), and is also equal to the distance between the center line of the semicircular groove (72) and the center line of the pressure bar (91).

3. The explosion-proof hydraulic system according to claim 2, characterized in that: The bottom of the inner groove (6) is set as a downward sloping surface, and the top of the inner groove (6) is a horizontal surface.

4. The explosion-proof hydraulic system according to claim 2, characterized in that: Both the sleeve (8) and the locking sleeve (11) are provided with multiple reinforcing holes (12) at equal intervals. The number of reinforcing holes (12) is the same as the number of steel balls (92). When the slide rod (7) is in the initial position, half of the steel balls (92) are located inside the corresponding reinforcing hole (12).

5. The explosion-proof hydraulic system according to claim 2, characterized in that: The bottom of the pressure rod (91) is set to arc shape on both sides, and the top of the pressure rod (91) is a sphere.

6. A side-tipping carriage, characterized in that: The explosion-proof hydraulic system according to claim 1 also includes a frame (1) and a box (2) rotatably connected to the top of the frame (1), wherein the frame (1) is rotatably connected to the top of the inner rod (5) and the box (2) is rotatably connected to the cylinder (3).

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