A jack, a rotary drill and an anti-rollover system

Abstract

The present application relates to a jack, a rotary drill and an anti-rollover system. The jack comprises: an outer tube, an oil cylinder is arranged inside the outer tube, a base is arranged at one end of the oil cylinder away from the outer tube, a through hole is opened at one end of the outer tube away from the base, a pin is arranged on the oil cylinder, the pin is inserted into the through hole, a first gap is formed between the pin and the through hole, the oil cylinder is provided with an interface partially extending out of the outer tube, a two-way valve is arranged on the outer wall of the outer tube, a pressure relief protrusion is arranged on the two-way valve, a second gap is formed between the pressure relief protrusion and the interface, the first gap is larger than the second gap, and when the jack is lifted up, the interface and the pressure relief protrusion are pressed against each other. The present application provides a pressure relief protrusion, and when the pressure relief protrusion is triggered, the oil cylinder is pressure-relieved in time, so that the drill rod driven by the oil cylinder is also unloaded, reducing the rollover problem caused by the drilling rig itself being lifted up by the drill rod during the drilling operation, improving the safety performance of the system, and protecting the drilling rig operator.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a jack, a rotary drill and an anti-rollover system. Background Art

[0002] There are generally three drilling methods for drilling rigs, such as top hammer, down-the-hole and cone-type. The above three drilling methods generally require the jack to be propped up before drilling to keep the drill body level, and then the operator completes the drilling operation by rotating and pressing down.

[0003] In the related art, for example, Chinese patent CN216767966U discloses a rotary drill feed hydraulic system and a rotary drill, including a hydraulic oil tank, a feed hydraulic cylinder, a main hydraulic pump, a pilot relief valve, a proportional relief valve and an electromagnetic switch valve; the main hydraulic pump is a closed hydraulic pump, the first oil port of the main hydraulic pump is connected to the rodless chamber of the feed hydraulic cylinder through the first oil circuit, and the second oil port is connected to the rod chamber of the feed hydraulic cylinder through the second oil circuit; the pilot relief valve is connected to the second oil circuit, the oil inlet and the oil outlet of the pilot relief valve are both connected to the second oil circuit, and a first check valve is arranged on the oil circuit between the oil inlet and the oil outlet; the proportional relief valve is connected to the control oil port of the pilot relief valve; the electromagnetic switch valve is respectively connected to the proportional relief valve and the pilot relief valve, and is configured to control the opening and closing of the proportional relief valve and the pilot relief valve to perform the first locking function. The utility model can realize drilling with a rotary drill bit or a down-the-hole hammer on a rotary drill.

[0004] However, due to the different geological conditions of open-pit mines, some may have some caves or cracks. When drilling operations are carried out under such geological conditions of cracks, the drill bit of the drill rig is easily stuck, and the downward pressure of the drill rig will increase sharply. When the reaction force of the ground on the drill rig is greater than the weight of the drilling side of the drill rig, the drill rod will push the jack on the drilling side away from the ground, causing the drill rig to tip over. As a result, when the drill bit is stuck during the drilling operation, the reverse force generated causes the jack that keeps the drill rig level to be unstable. Summary of the invention

[0005] 1. Problem to be solved

[0006] Based on this, it is necessary to provide a jack, a rotary drill and an anti-rollover system to address the problem in the prior art that the jack cannot maintain the stability of the drilling rig when the drill bit is stuck.

[0007] 2. Technical solution

[0008] In the first aspect, the present application provides a jack, comprising: an outer tube, an oil cylinder is arranged in the outer tube, a base is arranged at one end of the oil cylinder away from the outer tube, a through hole is opened at one end of the outer tube away from the base, a pin is arranged on the oil cylinder, the pin is passed through the through hole, a first gap is formed between the pin and the through hole, the oil cylinder is provided with an interface partially extending out of the outer tube, a two-way valve is arranged on the outer wall of the outer tube, a pressure relief protrusion is arranged on the two-way valve, a second gap is formed between the pressure relief protrusion and the interface, the first gap is larger than the second gap, and when the jack is lifted, the interface and the pressure relief protrusion are pressed against each other.

[0009] In a second aspect, the present application further provides a rotary drill, comprising: a frame, on which are provided a plurality of jacks as described in the first aspect.

[0010] In the third aspect, the present application also provides an anti-rollover system, which is applied to the rotary drill in the second aspect, including: a main pump assembly, the main pump assembly is connected to an oil tank, the main pump assembly is also connected to the oil cylinder through a balancing valve assembly, the main pump assembly is also connected to a pressure relief assembly, and the pressure relief assembly is connected to the oil tank.

[0011] In one embodiment, the main pump assembly includes an auxiliary oil pump, the oil inlet end of the auxiliary oil pump is connected to the oil tank, the oil outlet end of the auxiliary oil pump is connected to a relief valve, the relief valve is connected to a one-way valve, and the one-way valve is connected to the main oil pump.

[0012] In one embodiment, the balancing valve assembly includes a first balancing valve, a second balancing valve and a third balancing valve, the oil cylinder includes a thick rod chamber, one end of the first balancing valve is connected to the main oil pump, and the other end of the first balancing valve is connected to the thick rod chamber of the oil cylinder.

[0013] In one embodiment, the oil cylinder includes a thin rod cavity, one end of the second balancing valve is connected to the main oil pump, and the other end of the second balancing valve is connected to the thin rod cavity of the oil cylinder.

[0014] In one embodiment, one end of the third balancing valve is connected to the main oil pump, and the other end of the third balancing valve is connected to the oil tank.

[0015] In one embodiment, the main pump assembly also includes a VA port, and the pressure relief assembly includes a pressure regulating valve and a two-way valve, one end of the pressure regulating valve is connected to the VA port, and the other end of the pressure regulating valve is connected to the oil tank, one end of the two-way valve is connected to the VA port, and the other end of the two-way valve is connected to the oil tank.

[0016] In one of the embodiments, when it is necessary to control the rotary drill to drill downward, the main oil pump inputs the pressure oil into the second balancing valve, the second balancing valve transfers the pressure oil to the thin rod chamber of the oil cylinder through the second internal one-way valve, and the oil in the thick rod chamber flows back to the main oil pump through the first balancing valve.

[0017] In one of the embodiments, when it is necessary to control the recovery of the rotary drill, the main oil pump inputs the pressure oil into the first balancing valve, the first balancing valve transfers the pressure oil to the thick rod chamber of the oil cylinder through the first internal one-way valve, the oil portion of the thin rod chamber flows back to the main oil pump through the second balancing valve, and the oil portion of the thin rod chamber flows back to the oil tank through the third balancing valve.

[0018] The above-mentioned jack includes: an outer tube, an oil cylinder is arranged in the outer tube, a base is arranged at the end of the oil cylinder away from the outer tube, a through hole is opened at the end of the outer tube away from the base, a pin is arranged on the oil cylinder, the pin is passed through the through hole, a first gap is formed between the pin and the through hole, the oil cylinder is provided with an interface partially extending out of the outer tube, a two-way valve is arranged on the outer wall of the outer tube, a pressure relief protrusion is arranged on the two-way valve, a second gap is formed between the pressure relief protrusion and the interface, the first gap is larger than the second gap, and when the jack is lifted up, the interface and the pressure relief protrusion are pressed against each other.

[0019] 3. Beneficial effects

[0020] The present application sets a pressure relief protrusion, and when the pressure relief protrusion is triggered, the oil cylinder is promptly pressure-relieved, so that the drill rod driven by the oil cylinder is also unloaded, thereby reducing the problem of the drilling rig tipping over caused by the drilling rig itself being lifted up by the drill rod during the drilling operation, improving the safety performance of the system, and protecting the drilling rig operator; and by setting the first gap, when the jack is lifted up due to the jamming of the drill rod, it can be pressed down under the gravity of the oil cylinder, and at the same time, when the second gap is set and kept smaller than the first gap, it is ensured that the oil cylinder can promptly trigger the pressure relief protrusion during the downward pressing process, thereby ensuring that the jack can promptly trigger the pressure relief operation after being lifted up, effectively avoiding the problem of the drilling rig tipping over caused by the drilling rig itself being lifted up by the drill rod during the drilling operation, improving the safety performance of the system, and protecting the drilling rig operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1This is a schematic diagram of the overall structure of the jack in some embodiments of the present application;

[0023] Figure 2 It is a cross-sectional schematic diagram of a jack in some embodiments of the present application;

[0024] Figure 3 It is a schematic diagram of a local structure for embodying a pressure relief protrusion in some embodiments of the present application;

[0025] Figure 4 It is a schematic diagram of the overall structure of a rotary drill in some embodiments of the present application;

[0026] Figure 5 This is a schematic diagram of an anti-rollover system in some embodiments of the present application.

[0027] Description of Figure Numbers:

[0028] 100, outer tube; 200, oil cylinder; 300, base; 400, through hole; 500, pin shaft; 600, interface; 700, two-way valve; 800, pressure relief protrusion; 900, frame; 1000, main pump assembly; 1010, auxiliary oil pump; 1020, overflow valve; 1030, one-way valve; 1040, main oil pump; 1100, oil tank; 1200, balancing valve assembly; 1210, first balancing valve; 1211, first internal one-way valve; 1220, second balancing valve; 1221, second internal one-way valve; 1230, third balancing valve; 1231, third internal one-way valve; 1300, pressure relief assembly; 1310, pressure regulating valve. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] In order to solve the problem in the prior art that due to the different geological conditions of open-pit mines, some of which may have some caves or fissures, the drill bit of the drill rig is easily stuck when drilling under such geological conditions of fissures, and the downward pressure of the drill rig will increase sharply. When the reaction force of the ground on the drill rig is greater than the weight of the drilling side of the drill rig, the drill rod will push the jack on the drilling side away from the ground, causing the drill rig to roll over. On the one hand, referring to Figure 1 , Figure 2 and Figure 3The present application provides a jack, including an outer cylinder 100, an oil cylinder 200 is connected inside the outer cylinder 100, and one end of the oil cylinder 200 away from the outer cylinder 100 is fixedly connected to a base 300, a through hole 400 is opened at the top of the outer cylinder 100, and a pin 500 is passed through the end of the oil cylinder 200 facing the top of the outer cylinder 100, and the pin 500 is passed through the through hole 400, and a first gap is formed between the pin 500 and the through hole 400, a connecting hole is opened on the outer cylinder 100, and an interface 600 partially extending out of the outer cylinder 100 is fixedly connected to the oil cylinder 200, a two-way valve 700 is fixedly connected to the outer wall of the outer cylinder 100, and a pressure relief protrusion 800 is connected to the two-way valve 700, and a second gap is formed between the pressure relief protrusion 800 and the interface 600, and the first gap is larger than the second gap. When the jack is lifted, the interface 600 and the pressure relief protrusion 800 are pressed against each other.

[0036] Among them, the second gap is generally set to a safe distance between the pressure relief protrusion 800 and the outer diameter of the interface 600, generally 0.5mm-1mm, and the first gap is the part where the diameter of the through hole 400 is larger than the diameter of the pin shaft 500, which is set to 3mm in this application.

[0037] In this embodiment, by providing the pressure relief protrusion 800, when the pressure relief protrusion 800 is triggered, the oil cylinder 200 is promptly subjected to pressure relief operation, so that the drill rod driven by the oil cylinder 200 is also unloaded, thereby reducing the problem of the drilling rig tipping over due to the drilling rig itself being lifted up by the drill rod during the drilling operation, improving the safety performance of the system, and protecting the drilling rig operator; and by providing the first gap, when the jack is lifted up due to the jamming of the drill rod, it can be pressed down under the gravity of the oil cylinder 200, and at the same time, when the second gap is provided and the second gap is kept smaller than the first gap, it is ensured that the oil cylinder 200 can promptly trigger the pressure relief protrusion 800 during the downward pressing process, thereby ensuring that the jack can promptly trigger the pressure relief operation after being lifted up, effectively avoiding the problem of the drilling rig tipping over due to the drilling rig itself being lifted up by the drill rod during the drilling operation, improving the safety performance of the system, and protecting the drilling rig operator.

[0038] Second, refer to Figure 1 and Figure 4 The present application provides a rotary drill, comprising: a frame 900, on which are disposed a plurality of jacks as described in the first aspect.

[0039] Among them, three jacks are arranged in this embodiment, which are respectively arranged on the left side, right side and rear side of the drill, and the jacks are fixedly connected to the frame 900 by bolts; when the rotary drill is in the walking mode, the jacks retract the base 300 through the cylinder 200; when the rotary drill is in the drilling mode, the jacks extend the base 300 to a corresponding distance through the cylinder 200, keep the rotary drill in a horizontal position, and then carry out drilling operations.

[0040] Thirdly, refer to Figure 5 The present application provides an anti-rollover system, which is applied to the rotary drill of the second aspect, including: a main pump assembly 1000, the main pump assembly 1000 is connected to an oil tank 1100, the main pump assembly 1000 is also connected to the oil cylinder 200 through a balancing valve assembly 1200, the main pump assembly 1000 is also connected to a pressure relief assembly 1300, and the pressure relief assembly 1300 is connected to the oil tank 1100.

[0041] The main pump assembly 1000 includes an auxiliary oil pump 1010 , the oil inlet end of the auxiliary oil pump 1010 is connected to the oil tank 1100 , the oil outlet end of the auxiliary oil pump 1010 is connected to a relief valve 1020 , the relief valve 1020 is connected to a one-way valve 1030 , and the one-way valve 1030 is connected to the main oil pump 1040 .

[0042] Among them, the system is a closed system, the oil inlet and outlet of the main pump are respectively connected to one end of the first balancing valve 1210, the second balancing valve 1220 and the third balancing valve 1230, the other end of the first balancing valve 1210 is connected to the thick rod chamber of the cylinder 200, the other end of the second balancing valve 1220 is connected to the thin rod chamber of the cylinder 200, and the other end of the third balancing valve 1230 is connected to the oil tank 1100.

[0043] The balancing valve assembly 1200 includes a first balancing valve 1210, a second balancing valve 1220 and a third balancing valve 1230. The oil cylinder 200 includes a thick rod chamber. One end of the first balancing valve 1210 is connected to the main oil pump 1040, and the other end of the first balancing valve 1210 is connected to the thick rod chamber of the oil cylinder 200. The oil cylinder 200 includes a thin rod chamber. One end of the second balancing valve 1220 is connected to the main oil pump 1040, and the other end of the second balancing valve 1220 is connected to the thin rod chamber of the oil cylinder 200. One end of the third balancing valve 1230 is connected to the main oil pump 1040, and the other end of the third balancing valve 1230 is connected to the oil tank 1100.

[0044] Among them, the auxiliary oil pump 1010 provides replenishing oil and control oil for the entire closed system. The oil inlet of the auxiliary oil pump 1010 is connected to the oil tank 1100, and the other end is connected to the inlet of the overflow valve 1020. The outlet of the overflow valve 1020 is respectively connected to the inlet of two one-way valves 1030 and the inlet of another overflow valve 1020; when replenishing oil, the low-pressure side of the main oil pump 1040 is replenished through the overflow valve 1020 and the one-way valve 1030, and the excess oil returns to the oil tank 1100 through another overflow valve 1020. At the same time, the oil of the auxiliary oil pump 1010 is also needed to control the swash plate of the main oil pump 1040.

[0045] The main pump assembly 1000 also includes a VA port, and the pressure relief assembly 1300 includes a pressure regulating valve 1310 and a two-way valve 700, one end of the pressure regulating valve 1310 is connected to the VA port, and the other end of the pressure regulating valve 1310 is connected to the oil tank 1100, one end of the two-way valve 700 is connected to the VA port, and the other end of the two-way valve 700 is connected to the oil tank 1100.

[0046] The main pump assembly 1000 is provided with a VA port, which is respectively connected to the inlet of the pressure regulating valve 1310 and the inlet of the two two-way valves 700; the outlets of the pressure regulating valve 1310 and the two-way valve 700 are connected to the oil tank 1100, wherein the pressure regulating valve 1310 can be set to the maximum pressure of the main oil pump 1040; when the entire system reaches the maximum pressure setting value, the pressure of the main oil pump 1040 will no longer continue to increase, effectively protecting the entire hydraulic system; and when the pressure relief protrusion 800 of any one of the two two-way valves 700 is triggered, the two-way valve 700 changes from a disconnected state to a connected state, so the oil at the VA port will directly return to the oil tank 1100 through the two-way valve 700, so that the pressure of the main oil pump 1040 returns to zero, thereby preventing the main pump from continuing to output pressure and preventing the drilling rig from tipping over.

[0047] In one of the embodiments, when it is necessary to control the rotary drill to drill downward, the main oil pump 1040 inputs the pressure oil to the second balancing valve 1220, and the second balancing valve 1220 transfers the pressure oil to the thin rod chamber of the cylinder 200 through the second internal one-way valve 1221, and the oil in the thick rod chamber flows back to the main oil pump 1040 through the first balancing valve 1210.

[0048] When the rotary drill is drilling downward, the pressure oil of the main oil pump 1040 enters the thin rod chamber of the oil cylinder 200 through the second internal check valve 1221 in the second balance valve 1220. Since the piston rod of the oil cylinder 200 is fixed at both ends and the cylinder barrel is a movable part, the cylinder barrel will move downward, and the oil in the thick rod chamber returns to the suction side of the main oil pump 1040 through the first balance valve 1210, thereby driving the drill rod of the entire drilling rig to move downward to achieve drilling. Since the pressure regulating valve 1310 acts on the VA port of the main pump assembly 1000, the set pressure of the pressure regulating valve 1310 directly affects the maximum pressure that the main oil pump 1040 can provide.

[0049] In one of the embodiments, when it is necessary to control the recovery of the rotary drill, the main oil pump 1040 inputs the pressure oil to the first balancing valve 1210, and the first balancing valve 1210 transmits the pressure oil to the thick rod chamber of the cylinder 200 through the first internal one-way valve 1211, and the oil portion of the thin rod chamber flows back to the main oil pump 1040 through the second balancing valve 1220, and the oil portion of the thin rod chamber flows back to the oil tank 1100 through the third balancing valve 1230.

[0050] After the rotary drill has finished drilling, the drill rod needs to be recovered. At this time, the pressure oil of the main oil pump 1040 passes through the first one-way valve 1211 in the first balancing valve 1210 to reach the thick rod chamber of the oil cylinder 200. After the oil in the thin rod chamber passes through the second balancing valve 1220, part of it returns to the oil suction port of the main oil pump 1040, and the other part flows back to the oil tank 1100 through the third balancing valve 1230.

[0051] It is worth mentioning that the upper and lower cavities of the oil cylinder 200 are inconsistent. The lower thin rod chamber contains more hydraulic oil than the upper thick rod chamber. Therefore, when the thin rod chamber returns oil, the excess oil will be leaked back to the oil tank 1100 through the third balancing valve 1230.

[0052] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A jack, comprising an outer cylinder (100), wherein an oil cylinder (200) is arranged inside the outer cylinder (100), and a base (300) is arranged at one end of the oil cylinder (200) away from the outer cylinder (100), characterized in that: A through hole (400) is provided at one end of the outer cylinder (100) away from the base (300); a pin shaft (500) is provided on the oil cylinder (200); the pin shaft (500) is inserted into the through hole (400); a first gap is formed between the pin shaft (500) and the through hole (400); the oil cylinder (200) is provided with an interface (600) partially extending out of the outer cylinder (100); a two-way valve (700) is provided on the outer wall of the outer cylinder (100); a pressure relief protrusion (800) is provided on the two-way valve (700); a second gap is formed between the pressure relief protrusion (800) and the interface (600); the first gap is larger than the second gap; when the jack is lifted up, the interface (600) and the pressure relief protrusion (800) are pressed against each other.

2. A rotary drill, characterized in that: It comprises a frame (900), on which a plurality of jacks as claimed in claim 1 are arranged.

3. An anti-rollover system, applied to the rotary drill according to claim 2, characterized in that: The invention comprises a main pump assembly (1000), wherein the main pump assembly (1000) is connected to an oil tank (1100), and the main pump assembly (1000) is also connected to an oil cylinder (200) via a balancing valve assembly (1200). The main pump assembly (1000) is also connected to a pressure relief assembly (1300), and the pressure relief assembly (1300) is in communication with the oil tank (1100).

4. The anti-rollover system according to claim 3, characterized in that: The main pump assembly (1000) comprises an auxiliary oil pump (1010), the oil inlet end of the auxiliary oil pump (1010) is connected to the oil tank (1100), the oil outlet end of the auxiliary oil pump (1010) is connected to a relief valve (1020), the relief valve (1020) is connected to a check valve (1030), and the check valve (1030) is connected to the main oil pump (1040).

5. The anti-rollover system according to claim 4, wherein the balancing valve assembly (1200) comprises a first balancing valve (1210), a second balancing valve (1220) and a third balancing valve (1230), and the oil cylinder (200) comprises a thick rod chamber, characterized in that: One end of the first balancing valve (1210) is connected to the main oil pump (1040), and the other end of the first balancing valve (1210) is connected to the thick rod chamber of the oil cylinder (200).

6. The anti-rollover system according to claim 4, wherein the oil cylinder (200) comprises a thin rod chamber, characterized in that: One end of the second balancing valve (1220) is connected to the main oil pump (1040), and the other end of the second balancing valve (1220) is connected to the thin rod chamber of the oil cylinder (200).

7. The anti-rollover system according to claim 4, characterized in that: One end of the third balancing valve (1230) is connected to the main oil pump (1040), and the other end of the third balancing valve (1230) is connected to the oil tank (1100).

8. The anti-rollover system according to claim 3, wherein the main pump assembly (1000) further comprises a VA port, characterized in that: The pressure relief assembly (1300) comprises a pressure regulating valve (1310) and a two-way valve (700); one end of the pressure regulating valve (1310) is connected to the VA port, and the other end of the pressure regulating valve (1310) is connected to the oil tank (1100); one end of the two-way valve (700) is connected to the VA port, and the other end of the two-way valve (700) is connected to the oil tank (1100).

9. The anti-rollover system according to claim 8, characterized in that: When it is necessary to control the rotary drill to drill downward, the main oil pump (1040) inputs the pressure oil to the second balancing valve (1220), and the second balancing valve (1220) transfers the pressure oil to the thin rod chamber of the oil cylinder (200) through the second internal one-way valve (1221), and the oil in the thick rod chamber flows back to the main oil pump (1040) through the first balancing valve (1210).

10. The anti-rollover system according to claim 9, characterized in that: When it is necessary to control the recovery of the rotary drill, the main oil pump (1040) inputs the pressure oil into the first balancing valve (1210), and the first balancing valve (1210) transmits the pressure oil to the thick rod chamber of the oil cylinder (200) through the first internal one-way valve (1211), and the oil part of the thin rod chamber flows back to the main oil pump (1040) through the second balancing valve (1220), and the oil part of the thin rod chamber flows back to the oil tank (1100) through the third balancing valve (1230).

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