Electro-hydraulic dual air shot protection system for a rock drill
Patent Information
- Application Number
- CN202522514785.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-27
AI Technical Summary
[0002]公知的，在隧道掘进、矿山开采等工程中，拱锚注联合作业台车搭载的凿岩机是关键施工设备；凿岩机在钻进过程中，若突然遭遇泥土层、破碎带或空穴等地质异常情况，钻头会因失去有效负载而发生“空打”现象；此时，若凿岩机的冲击机构仍在高压油驱动下持续高频冲击，而推进机构又无法提供足够的反作用力，将导致冲击能量无法有效传递，造成凿岩机内部活塞、钎杆等关键部件承受剧烈冲击载荷，极易引发设备损坏，缩短使用寿命，甚至造成安全事故；现有技术中，单一的电气或液压保护系统存在可靠性不足的问题，而且泄压效率较低
本实用新型公开的用于凿岩机的电液双重防空打保护系统，在遇到空穴，凿岩机推进油压由于负载不足而压力降低时，电控部分是通过第一压力传感器检测推进油路压力降低，然后控制电磁阀打开，对冲击油路进行泄压，液压控制部分是通过推进油压降低来直接控制第一液压阀打开，对冲击油路进行泄压；而当冲击油路压力降低时，又能够直接控制第二液压阀打开，进一步降低推进油压；两个系统同时工作，互相独立，可有效对遇到的空打现象进行检测并及时反馈控制保护，并结合第二阀组的连续泄压动作，提高泄压效率。
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Figure CN224859813U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic control technology for rock drills, and in particular to an electro-hydraulic dual anti-dry-firing protection system for rock drills. Background Technology
[0002] As is well known, in tunnel excavation, mining, and other engineering projects, the rock drill mounted on the arch-anchor-grouting combined operation trolley is a key construction equipment. During the drilling process, if the rock drill suddenly encounters geological anomalies such as soil layers, fracture zones, or cavities, the drill bit will experience "dry drilling" due to loss of effective load. At this time, if the rock drill's impact mechanism continues to impact at high frequency under high-pressure oil drive, and the propulsion mechanism cannot provide sufficient reaction force, the impact energy will not be effectively transmitted, causing critical components such as the piston and drill rod inside the rock drill to bear severe impact loads, which can easily lead to equipment damage, shorten service life, or even safety accidents. In the existing technology, single electrical or hydraulic protection systems have insufficient reliability and low pressure relief efficiency. Utility Model Content
[0003] In order to overcome the shortcomings in the background technology and solve the existing technical problems, this utility model discloses an electro-hydraulic dual anti-dry-shooting protection system for rock drills, which can improve the reliability of anti-dry-shooting and improve the pressure relief efficiency.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: An electro-hydraulic dual anti-dry-firing protection system for a rock drill includes an impact oil circuit and a propulsion oil circuit connected to the front and rear of the rock drill body, respectively. The impact oil circuit and the propulsion oil circuit are respectively connected to a pressure relief valve assembly and a first pressure sensor. The pressure relief valve assembly includes a solenoid valve connected to the first pressure sensor via a controller, and can open to control the pressure relief of the impact oil circuit when a low-pressure signal is received from the first pressure sensor. The impact oil circuit is connected to a first valve assembly, which includes a first hydraulic valve capable of controlling the pressure relief of the impact oil circuit based on a hydraulic pressure reduction signal from the propulsion oil circuit. The propulsion oil circuit is connected to a second valve assembly, which includes a second hydraulic valve capable of controlling the pressure relief of the propulsion oil circuit based on a hydraulic pressure reduction signal from the impact oil circuit.
[0005] Furthermore, the impact oil circuit is connected to a second pressure sensor.
[0006] Furthermore, the controller is set as a PLC or an engineering machinery controller.
[0007] By adopting the technical solution described above, this utility model has the following beneficial effects: This utility model discloses an electro-hydraulic dual anti-dry-shooting protection system for rock drills. When encountering a cavity, if the rock drill's propulsion oil pressure drops due to insufficient load, the electronic control unit detects the pressure drop in the propulsion oil circuit through a first pressure sensor and then controls the solenoid valve to open, relieving pressure in the impact oil circuit. The hydraulic control unit directly controls the first hydraulic valve to open, relieving pressure in the impact oil circuit, based on the decrease in propulsion oil pressure. Conversely, when the impact oil circuit pressure decreases, it can directly control the second hydraulic valve to open, further reducing the propulsion oil pressure. The two systems operate simultaneously and independently, effectively detecting and promptly responding to dry-shooting phenomena for control and protection. Combined with the continuous pressure relief action of the second valve group, the pressure relief efficiency is improved. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of an embodiment of the present utility model; In the diagram: 1. Impact oil circuit; 2. Propulsion oil circuit; 3. First pressure sensor; 4. Pressure relief valve assembly; 401. Solenoid valve; 5. Second valve assembly; 501. Second hydraulic valve; 6. First valve assembly; 601. First hydraulic valve; 7. Second pressure sensor. Detailed Implementation
[0009] The technical solution of this utility model will be described below with reference to the accompanying drawings of the embodiments of this utility model. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this utility model for the convenience of describing this utility model, and do not indicate or imply that the device or element referred to must have a specific orientation.
[0010] Combined with appendix Figure 1 The electro-hydraulic dual anti-dry-strike protection system for rock drills includes an impact oil circuit 1 and a propulsion oil circuit 2 connected to the front and rear of the rock drill body, respectively. During operation, when encountering a cavity, the propulsion oil pressure of the rock drill will automatically decrease due to insufficient load. The improvement of this utility model is that a pressure relief valve group 4 and a first pressure sensor 3 are respectively connected to the impact oil circuit 1 and the propulsion oil circuit 2. The pressure relief valve group 4 includes a solenoid valve 401 that is signal-connected to the first pressure sensor 3 through a controller. When a low pressure detection signal is received from the first pressure sensor 3, the valve can open to control the pressure relief of the impact oil circuit 1. That is, when the first pressure sensor 3 detects that the pressure of the propulsion oil circuit 2 has decreased, it feeds back to the solenoid valve 401 to control the pressure reduction of the impact oil circuit 1, thereby realizing electronic pressure reduction protection. The impact oil circuit 1 is connected to a first valve group 6. The first valve group 6 includes a first hydraulic valve 601 that can control the pressure relief of the impact oil circuit 1 according to the hydraulic pressure reduction signal of the propulsion oil circuit 2. The first hydraulic valve 601 is an automated component that controls the opening and closing of the pressure oil operation pipeline. That is, the oil pressure control pipeline of the first hydraulic valve 601 is connected to the propulsion oil circuit 2. When the pressure of the propulsion oil circuit 2 decreases, the flow pipeline of the first hydraulic valve 601 can open to directly control the pressure reduction of the impact oil circuit 1, thereby realizing hydraulic control pressure reduction protection. As needed, the impact oil circuit 1 is connected to a second pressure sensor 7 and is connected to the controller signal. The controller can be set as a PLC or a construction machinery controller, which can further detect the pressure change of the impact oil circuit 1, thereby confirming whether the electrical control protection and hydraulic control protection are effective. The propulsion oil circuit 2 is connected to a second valve group 5. The second valve group 5 includes a second hydraulic valve 501 that can control the pressure relief of the propulsion oil circuit 2 according to the hydraulic pressure reduction signal of the impact oil circuit 1. The second valve group 5 and the first valve group 6 are similar in operation function. That is, when the pressure of the impact oil circuit 1 decreases, the flow line of the second hydraulic valve 501 can be opened to directly control the pressure of the propulsion oil circuit 2 to decrease further, thereby greatly improving the pressure relief control efficiency and ensuring that the pressure reduction and anti-aircraft operation are more timely.
[0011] The electro-hydraulic dual anti-dry-run protection system for rock drills described in this utility model reduces the propulsion oil pressure when the rock drill encounters soil layers, fracture zones, or cavities during drilling. Under the dual protection of electronic and hydraulic control, the pressure of the impact oil circuit 1 is reduced, and the pressure reduction of the impact oil circuit 1 is fed back to the second valve group 5, which further controls the pressure reduction of the propulsion oil circuit 2, thereby meeting the protection requirements.
[0012] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.
Claims
1. An electro-hydraulic dual anti-dry-firing protection system for a rock drill, comprising an impact oil circuit and a propulsion oil circuit connected to the front and rear of the rock drill body respectively, characterized in that: The impact oil circuit and the propulsion oil circuit are respectively connected to a pressure relief valve assembly and a first pressure sensor. The pressure relief valve assembly includes a solenoid valve that is signal-connected to the first pressure sensor via a controller, and can open to control the pressure relief of the impact oil circuit when a low-pressure signal is received from the first pressure sensor. The impact oil circuit is connected to a first valve assembly, which includes a first hydraulic valve that can control the pressure relief of the impact oil circuit according to the hydraulic pressure reduction signal of the propulsion oil circuit. The propulsion oil circuit is connected to a second valve assembly, which includes a second hydraulic valve that can control the pressure relief of the propulsion oil circuit according to the hydraulic pressure reduction signal of the impact oil circuit.
2. The electro-hydraulic dual anti-dry-firing protection system for rock drills according to claim 1, characterized in that: The impact oil circuit is connected to a second pressure sensor.
3. The electro-hydraulic dual anti-dry-firing protection system for rock drills according to claim 1, characterized in that: The controller is set as a PLC or an engineering machinery controller.