阅读说明：本技术 切顶泄压台车的链刀张紧控制系统及方法 (Chain cutter tensioning control system and method of roof cutting pressure relief trolley ) 是由 刘飞香 程永亮 左耀 刘晨晖 刘伟 李永星 王红民 赵燕斌 胡业明 于 2021-08-12 设计创作，主要内容包括：本发明提供了一种切顶泄压台车的链刀张紧控制系统,其包括张紧油缸、第一张紧油缸控制系统及第二张紧油缸控制系统,第一张紧油缸控制系统包括手动泵、第一三位四通换向阀及第一油箱；第一三位四通换向阀的进油口与手动泵连通,第一输油口与张紧油缸的无杆腔连通,回油口与第一油箱连通,第二输油口与张紧油缸的有杆腔连通；第二张紧油缸控制系统包括液压源、第二三位四通换向阀及第二油箱；第二三位四通换向阀的进油口与液压源连通,第一输油口与张紧油缸的无杆腔连通,回油口与第二油箱连通,第二输油口与张紧油缸的有杆腔连通。与现有技术相比,本发明的切顶泄压台车的链刀张紧控制系统的成本低、作业效率高。(The invention provides a chain cutter tensioning control system of a top-cutting pressure-relief trolley, which comprises a tensioning oil cylinder, a first tensioning oil cylinder control system and a second tensioning oil cylinder control system, wherein the first tensioning oil cylinder control system comprises a manual pump, a first three-position four-way reversing valve and a first oil tank; an oil inlet of the first three-position four-way reversing valve is communicated with the manual pump, a first oil delivery port is communicated with a rodless cavity of the tensioning oil cylinder, an oil return port is communicated with a first oil tank, and a second oil delivery port is communicated with a rod cavity of the tensioning oil cylinder; the second tensioning oil cylinder control system comprises a hydraulic source, a second three-position four-way reversing valve and a second oil tank; an oil inlet of the second three-position four-way reversing valve is communicated with a hydraulic source, a first oil delivery port is communicated with a rodless cavity of the tensioning oil cylinder, an oil return port is communicated with a second oil tank, and a second oil delivery port is communicated with a rod cavity of the tensioning oil cylinder. Compared with the prior art, the chain cutter tensioning control system of the top-cutting pressure-relief trolley is low in cost and high in operation efficiency.)

1. The utility model provides a chain sword tensioning control system of pressure release platform truck cuts, its characterized in that includes:

the tensioning oil cylinder is used for controlling tensioning and loosening of the chain cutter;

the tensioning oil cylinder control system comprises a first tensioning oil cylinder control system and a second tensioning oil cylinder control system;

wherein:

the first tensioning oil cylinder control system comprises a manual pump, a first three-position four-way reversing valve and a first oil tank, wherein an oil inlet of the first three-position four-way reversing valve is communicated with the manual pump, a first oil delivery port of the first three-position four-way reversing valve is communicated with a rodless cavity of the tensioning oil cylinder, an oil return port of the first three-position four-way reversing valve is communicated with the first oil tank, and a second oil delivery port of the first three-position four-way reversing valve is communicated with a rod cavity of the tensioning oil cylinder;

the second tensioning oil cylinder control system comprises a hydraulic source, a second three-position four-way reversing valve and a second oil tank, an oil inlet of the second three-position four-way reversing valve is communicated with the hydraulic source, a first oil delivery port of the second three-position four-way reversing valve is communicated with a rodless cavity of the tensioning oil cylinder, an oil return port of the second three-position four-way reversing valve is communicated with the second oil tank, and a second oil delivery port of the second three-position four-way reversing valve is communicated with a rod cavity of the tensioning oil cylinder.

2. The chain cutter tension control system of the topping and pressure relief trolley according to claim 1, further comprising:

the hydraulic lock is arranged between the tensioning oil cylinder and the tensioning oil cylinder control system;

the first oil delivery port of the first three-position four-way reversing valve and the first oil delivery port of the second three-position four-way reversing valve are communicated with the rodless cavity of the tensioning oil cylinder through the hydraulic lock, and the second oil delivery port of the first three-position four-way reversing valve and the second oil delivery port of the second three-position four-way reversing valve are communicated with the rod cavity of the tensioning oil cylinder through the hydraulic lock.

3. The chain cutter tensioning control system of the topping and pressure releasing trolley according to claim 2, wherein the first oil delivery port of the first three-position four-way reversing valve, the first oil delivery port of the second three-position four-way reversing valve and the hydraulic lock are communicated through a first tee joint.

4. The chain cutter tensioning control system of the topping and pressure releasing trolley according to claim 3, wherein the second oil delivery port of the first three-position four-way reversing valve, the second oil delivery port of the second three-position four-way reversing valve and the hydraulic lock are communicated through a second tee.

5. The chain blade tension control system of the topping and pressure relief trolley according to claim 4, further comprising:

and the displacement sensor is connected with the tensioning oil cylinder and used for detecting the expansion amount of a piston rod of the tensioning oil cylinder.

6. The chain cutter tension control system of the topping and pressure relief trolley according to claim 5, further comprising:

the first oil port and the second oil port are respectively communicated with the rod cavity and the rodless cavity of the tensioning oil cylinder;

a pressure sensor connected to the shuttle valve;

and the controller is electrically connected with the pressure sensor and used for cutting off the oil way according to the detection information of the pressure sensor.

7. The chain cutter tensioning control system of the topping and pressure releasing trolley according to claim 6, wherein the first three-position four-way reversing valve is a three-position four-way manual reversing valve, and the second three-position four-way reversing valve is a three-position four-way electromagnetic reversing valve.

8. A chain cutter tensioning control method of a roof cutting pressure relief trolley is characterized by comprising the following steps:

s1, providing a chain cutter tensioning control system of the top-cutting pressure-relief trolley according to any one of claims 1 to 7;

s2, adjusting the second three-position four-way reversing valve to enable an oil inlet of the second three-position four-way reversing valve to be communicated with a first oil delivery port of the second three-position four-way reversing valve, enable an oil return port of the second three-position four-way reversing valve to be communicated with a second oil delivery port of the second three-position four-way reversing valve, start the hydraulic source to enable pressure oil to flow into the rodless cavity of the tensioning oil cylinder, and enable hydraulic oil in the rod cavity of the tensioning oil cylinder to flow back to the second oil tank;

s3, closing the second three-position four-way reversing valve, adjusting the first three-position four-way reversing valve simultaneously, letting the oil inlet of the first three-position four-way reversing valve communicate with the first oil delivery port of the first three-position four-way reversing valve, the oil return port of the first three-position four-way reversing valve communicates with the second oil delivery port of the first three-position four-way reversing valve, and controlling the hand pump to make pressure oil flow into the tensioning oil cylinder in the rodless cavity, and the tensioning oil cylinder makes hydraulic oil in the rod cavity flow back to the first oil tank.

9. The method for controlling tensioning of chain cutter of topping decompression trolley according to claim 8, characterized in that after step S3, the method further comprises the following steps:

s4, adjusting the first three-position four-way reversing valve, enabling an oil inlet of the first three-position four-way reversing valve to be communicated with an oil delivery port of the second three-position four-way reversing valve, enabling an oil return port of the first three-position four-way reversing valve to be communicated with an oil delivery port of the first three-position four-way reversing valve, controlling the manual pump, enabling pressure oil to flow into the tensioning oil cylinder in the rod cavity, and enabling hydraulic oil in the rodless cavity of the tensioning oil cylinder to flow back to the first oil tank.

10. The method for controlling tensioning of chain cutter of topping decompression trolley according to claim 8, characterized in that after step S3, the method further comprises the following steps:

s4, close the first three-position four-way reversing valve, adjust simultaneously the second three-position four-way reversing valve lets the oil inlet of the second three-position four-way reversing valve with the second oil delivery mouth intercommunication of the second three-position four-way reversing valve, the oil return mouth of the second three-position four-way reversing valve with the first oil delivery mouth intercommunication of the second three-position four-way reversing valve, open the hydraulic source, make pressure oil flow into the tensioning cylinder have in the pole chamber, the tensioning cylinder the hydraulic oil flow back in the rodless chamber in the second oil tank.

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a chain cutter tensioning control system and method of a top-cutting pressure-relief trolley.

Background

The top-cutting pressure-relief trolley is mainly used for construction of seam-cutting operation on the top of a coal mine underground roadway and mainly comprises a chassis, a sliding platform, an electrical system, a hydraulic system, a chain cutter assembly and the like. The equipment can realize efficient, accurate and continuous roof cutting and seam making, and ensures safe and efficient roadway retaining of the stoping roadway. Before the operation of the top-cutting pressure-relief trolley, a chain must be tensioned to a certain degree, so that the chain cutter can normally cut a coal bed, and continuous top-cutting seam making is realized.

In the prior art, a chain cutter of a top-cutting pressure-relief trolley is tensioned through a manual pump or an electric hydraulic pump. And a manual pump is used for tensioning, so that the labor intensity of workers is high, and the operation efficiency is low. And the system cost is increased due to the fact that the electric proportional valve, the throttle valve, the booster and other hydraulic components are needed to be used for tensioning by using the electric hydraulic pump.

Disclosure of Invention

The chain cutter of the opposite-top-cutting pressure-relief trolley in the prior art is tensioned through a manual pump or an electric hydraulic pump, and therefore the technical problems of low operation efficiency or high cost are solved. The invention provides a chain cutter tensioning control system of a top-cutting pressure-relief trolley, which has the advantages of low cost, high operation efficiency, safety and reliability.

A chain cutter tensioning control system of a topping and pressure relief trolley comprises:

the tensioning oil cylinder is used for controlling tensioning and loosening of the chain cutter;

the tensioning oil cylinder control system comprises a first tensioning oil cylinder control system and a second tensioning oil cylinder control system;

wherein:

the first tensioning oil cylinder control system comprises a manual pump, a first three-position four-way reversing valve and a first oil tank, wherein an oil inlet of the first three-position four-way reversing valve is communicated with the manual pump, a first oil delivery port of the first three-position four-way reversing valve is communicated with a rodless cavity of the tensioning oil cylinder, an oil return port of the first three-position four-way reversing valve is communicated with the first oil tank, and a second oil delivery port of the first three-position four-way reversing valve is communicated with a rod cavity of the tensioning oil cylinder;

the second tensioning oil cylinder control system comprises a hydraulic source, a second three-position four-way reversing valve and a second oil tank, an oil inlet of the second three-position four-way reversing valve is communicated with the hydraulic source, a first oil delivery port of the second three-position four-way reversing valve is communicated with a rodless cavity of the tensioning oil cylinder, an oil return port of the second three-position four-way reversing valve is communicated with the second oil tank, and a second oil delivery port of the second three-position four-way reversing valve is communicated with a rod cavity of the tensioning oil cylinder.

Preferably, the method further comprises the following steps:

the hydraulic lock is arranged between the tensioning oil cylinder and the tensioning oil cylinder control system;

the first oil delivery port of the first three-position four-way reversing valve and the first oil delivery port of the second three-position four-way reversing valve are communicated with the rodless cavity of the tensioning oil cylinder through the hydraulic lock, and the second oil delivery port of the first three-position four-way reversing valve and the second oil delivery port of the second three-position four-way reversing valve are communicated with the rod cavity of the tensioning oil cylinder through the hydraulic lock.

Preferably, the first oil delivery port of the first three-position four-way reversing valve, the first oil delivery port of the second three-position four-way reversing valve and the hydraulic lock are communicated through a first tee joint.

Preferably, the second oil delivery port of the first three-position four-way reversing valve, the second oil delivery port of the second three-position four-way reversing valve and the hydraulic lock are communicated through a second tee joint.

Preferably, the method further comprises the following steps:

and the displacement sensor is connected with the tensioning oil cylinder and used for detecting the expansion amount of a piston rod of the tensioning oil cylinder.

Preferably, the method further comprises the following steps:

the first oil port and the second oil port are respectively communicated with the rod cavity and the rodless cavity of the tensioning oil cylinder;

the pressure sensor is connected with the shuttle valve and used for detecting the pressure of the tensioning oil cylinder;

and the controller is electrically connected with the pressure sensor and used for cutting off the oil way according to the detection information of the pressure sensor.

Preferably, the first three-position four-way reversing valve is a three-position four-way manual reversing valve, and the second three-position four-way reversing valve is a three-position four-way electromagnetic reversing valve.

Meanwhile, the invention also provides a chain cutter tensioning control method of the roof cutting pressure relief trolley, which comprises the following steps:

s1, providing a chain cutter tensioning control system of the top-cutting pressure-relief trolley according to any one of claims 1 to 7;

s2, adjusting the second three-position four-way reversing valve to enable an oil inlet of the second three-position four-way reversing valve to be communicated with a first oil delivery port of the second three-position four-way reversing valve, enable an oil return port of the second three-position four-way reversing valve to be communicated with a second oil delivery port of the second three-position four-way reversing valve, start the hydraulic source to enable pressure oil to flow into the rodless cavity of the tensioning oil cylinder, and enable hydraulic oil in the rod cavity of the tensioning oil cylinder to flow back to the second oil tank;

s3, closing the second three-position four-way reversing valve, adjusting the first three-position four-way reversing valve simultaneously, letting the oil inlet of the first three-position four-way reversing valve communicate with the first oil delivery port of the first three-position four-way reversing valve, the oil return port of the first three-position four-way reversing valve communicates with the second oil delivery port of the first three-position four-way reversing valve, and controlling the hand pump to make pressure oil flow into the tensioning oil cylinder in the rodless cavity, and the tensioning oil cylinder makes hydraulic oil in the rod cavity flow back to the first oil tank.

Preferably, after the step S3, the method further includes the following steps:

s4, adjusting the first three-position four-way reversing valve, enabling an oil inlet of the first three-position four-way reversing valve to be communicated with an oil delivery port of the second three-position four-way reversing valve, enabling an oil return port of the first three-position four-way reversing valve to be communicated with an oil delivery port of the first three-position four-way reversing valve, controlling the manual pump, enabling pressure oil to flow into the tensioning oil cylinder in the rod cavity, and enabling hydraulic oil in the rodless cavity of the tensioning oil cylinder to flow back to the first oil tank.

Preferably, after the step S3, the method further includes the following steps:

s4, close the first three-position four-way reversing valve, adjust simultaneously the second three-position four-way reversing valve lets the oil inlet of the second three-position four-way reversing valve with the second oil delivery mouth intercommunication of the second three-position four-way reversing valve, the oil return mouth of the second three-position four-way reversing valve with the first oil delivery mouth intercommunication of the second three-position four-way reversing valve, open the hydraulic source, make pressure oil flow into the tensioning cylinder have in the pole chamber, the tensioning cylinder the hydraulic oil flow back in the rodless chamber in the second oil tank.

Compared with the prior art, the chain cutter tensioning control system of the top-cutting pressure-relief trolley comprises a first tensioning oil cylinder control system and a second tensioning oil cylinder control system, the first tensioning oil cylinder control system comprises the manual pump, and the second tensioning oil cylinder control system comprises the hydraulic source. The chain cutter tensioning control system of the topping and pressure-releasing trolley combines manual tensioning and electro-hydraulic tensioning, realizes different tensioning modes through oil circuit switching, and is simple in structure and effective in reducing cost.

The chain cutter tensioning control method of the topping and pressure relief trolley provided by the invention has the advantages that the operation efficiency is high, the loosening degree of the chain cutter can be controlled, in addition, the oil cylinder is controlled to stretch out and draw back through the electro-hydraulic control in the initial stage, the adjusting time can be effectively shortened, and the tensioning efficiency can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a chain cutter tension control system of a topping and pressure relief trolley according to an embodiment.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.

The invention provides a chain cutter tensioning control system of a top-cutting pressure-relief trolley, which comprises a tensioning oil cylinder and a tensioning oil cylinder control system, wherein the tensioning oil cylinder control system comprises a first tensioning oil cylinder control system and a second tensioning oil cylinder control system, the first tensioning oil cylinder control system comprises a manual pump, a first three-position four-way reversing valve and a first oil tank, an oil inlet of the first three-position four-way reversing valve is communicated with the manual pump, a first oil delivery port of the first three-position four-way reversing valve is communicated with a rodless cavity of the tensioning oil cylinder, an oil return port of the first three-position four-way reversing valve is communicated with the first oil tank, and a second oil delivery port of the first three-position four-way reversing valve is communicated with a rod cavity of the tensioning oil cylinder; the second tensioning oil cylinder control system comprises a hydraulic source, a second three-position four-way reversing valve and a second oil tank, an oil inlet of the second three-position four-way reversing valve is communicated with the hydraulic source, a first oil delivery port of the second three-position four-way reversing valve is communicated with a rodless cavity of the tensioning oil cylinder, an oil return port of the second three-position four-way reversing valve is communicated with the second oil tank, and a second oil delivery port of the second three-position four-way reversing valve is communicated with a rod cavity of the tensioning oil cylinder. The chain cutter tensioning control system of the top-cutting pressure-relieving trolley is low in cost and high in operation efficiency.

Please refer to fig. 1. The embodiment provides a chain cutter tensioning control system of a top-cutting pressure-relief trolley, which comprises a tensioning oil cylinder 1 and a tensioning control system, wherein the tensioning oil cylinder 1 is used for controlling tensioning and loosening of a chain cutter, specifically, the tensioning oil cylinder 1 is used for realizing tensioning and loosening of the chain cutter through reciprocating motion of a piston rod, and the tensioning control system comprises a first tensioning oil cylinder control system and a second tensioning oil cylinder control system.

The first tensioning oil cylinder control system comprises a manual pump 2, a first three-position four-way reversing valve 3 and a first oil tank 4, the manual pump 2 is used for providing a hydraulic source when the chain cutter is manually tensioned to ensure the highest tensioning pressure required by tensioning the chain cutter, the first three-position four-way reversing valve 3 is used for controlling the direction of an oil path of the system, namely, the tensioning oil cylinder 1 is controlled to stretch when the chain cutter is manually tensioned, and the first oil tank 4 is used for storing hydraulic oil of the system. An oil inlet P of the first three-position four-way reversing valve 3 is communicated with the manual pump 2, a first oil delivery port A of the first three-position four-way reversing valve 3 is communicated with a rodless cavity of the tensioning oil cylinder 1, an oil return port T of the first three-position four-way reversing valve 3 is communicated with the first oil tank 4, and a second oil delivery port B of the first three-position four-way reversing valve 3 is communicated with a rod cavity of the tensioning oil cylinder 1.

The second tensioning oil cylinder control system comprises a hydraulic source 5, a second three-position four-way reversing valve 6 and a second oil tank 7, the hydraulic source 5 is used for providing a hydraulic source when the chain cutter is hydraulically tensioned, the second three-position four-way reversing valve 6 is used for controlling the direction of an oil path of the system, namely, the oil cylinder is controlled to stretch when the chain cutter is hydraulically tensioned, and the second oil tank 7 is used for storing hydraulic oil of the system. An oil inlet P of the second three-position four-way reversing valve 6 is communicated with the hydraulic source 5, a first oil delivery port A of the second three-position four-way reversing valve 6 is communicated with a rodless cavity of the tensioning oil cylinder 1, an oil return port T of the second three-position four-way reversing valve 6 is communicated with the second oil tank 7, and a second oil delivery port B of the second three-position four-way reversing valve 6 is communicated with a rod cavity of the tensioning oil cylinder 1.

Namely, in the embodiment, the chain cutter tensioning control system of the top-cutting pressure-relief trolley is a control system combining manual tensioning and electro-hydraulic tensioning.

It should be noted that, in the prior art, tensioning of the chain cutter is mainly to provide a pressure source for a hydraulic system through a manual pump or an electric hydraulic pump, and the two modes have the following disadvantages: first, manual pump hydraulic pressure tensioning system operating efficiency is low, intensity of labour is big. Secondly, the cost of the electro-hydraulic tensioning compound system is high. Through tests, the maximum tensioning pressure of the chain cutter can reach 42 MPa. The maximum working pressure of the common electric hydraulic pump is about 30MPa, and the tensioning pressure required by the chain cutter cannot be met. At present, the tensioning of the chain cutter is realized by additionally arranging a pressure increasing valve at a working oil port of a reversing valve. However, the electric proportional valve and the pressure increasing valve are expensive, and the cost of the whole vehicle is increased. Thirdly, the tensioning degree of the chain knife is not easy to control. This device requires a moderate tensioning of the chain cutter before it can be operated. Too loose, the chain is easy to fall off and deflect; too tight, the chain sword aggravates the degree of wear between blade and the link plate when the cutting, has increased the load of motor, has reduced equipment life.

In the embodiment, the chain cutter tensioning control system of the top-cutting pressure-relief trolley is simple in structure, reasonable in design, high in efficiency, easy to control and low in failure rate. The advantages of the manual tensioning system and the electro-hydraulic tensioning system are combined, and different tensioning modes are realized through oil circuit switching. The chain cutter tensioning device can be driven by the second tensioning oil cylinder control system in the initial stage, so that the preliminary tensioning of the chain cutter is realized, the operation efficiency is effectively improved, and the labor intensity of workers is reduced. Meanwhile, the control system can be switched to the first tensioning oil cylinder control system for driving, so that the maximum tensioning pressure can be guaranteed.

Preferably, the chain cutter tensioning control system of the top-cutting pressure-relief trolley further comprises a hydraulic lock 8, the hydraulic lock 8 is arranged between the tensioning oil cylinder 1 and the tensioning oil cylinder control system, and the hydraulic lock 8 is used for maintaining the tensioning pressure of the chain cutter, so that the chain cutter can keep a load, and the chain cannot automatically fall off when the equipment works. The first oil delivery port A of the first three-position four-way reversing valve 3 and the first oil delivery port A of the second three-position four-way reversing valve 6 are communicated with the rodless cavity of the tensioning oil cylinder 1 through the hydraulic lock 8, and the second oil delivery port B of the first three-position four-way reversing valve 3 and the second oil delivery port B of the second three-position four-way reversing valve 6 are communicated with the rod cavity of the tensioning oil cylinder 1 through the hydraulic lock 8. Therefore, the stability of the chain cutter tensioning control system of the top-cutting pressure-relief trolley in the using process can be effectively ensured.

Preferably, the first oil delivery port a of the first three-position four-way reversing valve 3, the first oil delivery port a of the second three-position four-way reversing valve 6 and the hydraulic lock 8 are communicated through a first tee joint 9. Namely, the first oil delivery port a of the first three-position four-way reversing valve 3, the first oil delivery port a of the second three-position four-way reversing valve 6 and the hydraulic lock 8 are respectively communicated with three ports of the first tee joint 9 through pipelines. Specifically, a V1 oil port of the hydraulic lock 8 is communicated with the first tee joint 9 through a pipeline. The first tee joint 9 is used for changing the direction of an oil path to realize the switching of oil transportation between two working modes of manual tensioning and hydraulic tensioning.

Preferably, the second oil delivery port B of the first three-position four-way reversing valve 3, the second oil delivery port B of the second three-position four-way reversing valve 6, and the hydraulic lock 8 are communicated through a second tee joint 10. Namely, the second oil delivery port B of the first three-position four-way reversing valve 3, the second oil delivery port B of the second three-position four-way reversing valve 6, and the hydraulic lock 8 are respectively communicated with three ports of the second tee joint 10 through pipelines. Specifically, the V2 oil port of the hydraulic lock 8 is communicated with the second tee joint 10 through a pipeline. The second tee joint 10 is used for switching oil return between two working modes of manual tensioning and hydraulic tensioning by changing the direction of an oil way.

Preferably, the chain cutter tensioning control system of the top-cutting pressure-relief trolley further comprises a displacement sensor 11, wherein the displacement sensor 11 is connected with the tensioning oil cylinder 1 and used for detecting the expansion amount of a piston rod of the tensioning oil cylinder 1 so as to reflect the tensioning degree of the chain cutter.

Preferably, the chain cutter tensioning control system of the topping and pressure-releasing trolley further comprises a shuttle valve 12, a pressure sensor 13 and a controller 14, wherein a first oil port a and a second oil port b of the shuttle valve 12 are respectively communicated with a rod cavity and a rodless cavity of the tensioning oil cylinder 1, the pressure sensor 13 is connected with the shuttle valve 12, and the controller 14 is electrically connected with the pressure sensor 13. The shuttle valve 12 is used for detecting the pressures of a rod cavity and a rodless cavity of the tensioning oil cylinder 1, and the pressure sensor 13 is used for detecting the size of an oil cavity of the tensioning oil cylinder 1 so as to reflect the maximum pressure of a tensioning system. The controller 14 is used for monitoring the maximum pressure of the system, and when the pressure of the system reaches a maximum set value, the oil way is automatically cut off, so that the use safety of the equipment is ensured.

Preferably, the first three-position four-way reversing valve 3 is a three-position four-way manual reversing valve, and the second three-position four-way reversing valve 6 is a three-position four-way electromagnetic reversing valve.

The tension degree of the chain cutter and the highest pressure of a tension system are monitored through the displacement sensor 11 and the controller 14, so that the safety of constructors and equipment is ensured. Meanwhile, the hydraulic lock 8 can also keep the load, and the chain cannot automatically fall off when the equipment works. The displacement sensor 11 detects the extension amount of the piston rod, so that the designed tensioning degree of the chain cutter can be reflected. The first oil port a and the second oil port b of the shuttle valve 12 are respectively connected with the rod cavity and the rodless cavity of the tensioning oil cylinder 1, and the pressure sensor 13 is communicated with the port of the shuttle valve 12. The maximum working pressure of the tensioning oil cylinder 1 can be monitored through the shuttle valve 12 and the pressure sensor 13, and when the pressure value exceeds a design value, the controller 14 receives a signal of the pressure sensor 13, feeds the signal back to a control system of equipment to cut off an oil circuit and gives an alarm.

Simultaneously, the embodiment also provides a chain cutter tensioning control method of the roof cutting and pressure relief trolley, which comprises the following steps:

s1, providing a chain cutter tensioning control system of the top-cutting pressure-relief trolley;

s2, adjusting the second three-position four-way reversing valve to enable an oil inlet of the second three-position four-way reversing valve to be communicated with a first oil delivery port of the second three-position four-way reversing valve, enable an oil return port of the second three-position four-way reversing valve to be communicated with a second oil delivery port of the second three-position four-way reversing valve, start the hydraulic source to enable pressure oil to flow into the rodless cavity of the tensioning oil cylinder, and enable hydraulic oil in the rod cavity of the tensioning oil cylinder to flow back to the second oil tank;

specifically, when the chain cutter is initially tensioned, the whole is supplied with pressure oil by the hydraulic pressure source 5. And an electromagnet on the right side of the second three-position four-way reversing valve 6 is electrified, the valve core moves to the right, P is communicated with A, and B is communicated with T. At the moment, the pressure oil of the port A of the second three-position four-way reversing valve 6 enters the rodless cavity of the tensioning oil cylinder 1 from the oil port V1 of the hydraulic lock 8 through the port C1 through the first tee joint 9, and the preliminary tensioning of the chain cutter is realized. And the hydraulic oil of the rod cavity of the tensioning oil cylinder 1 returns to the second oil tank 7 from the V2 oil port of the hydraulic lock 8 to the B port of the second three-position four-way reversing valve 6 through the second tee joint 10.

S3, closing the second three-position four-way reversing valve, adjusting the first three-position four-way reversing valve simultaneously, letting the oil inlet of the first three-position four-way reversing valve communicate with the first oil delivery port of the first three-position four-way reversing valve, the oil return port of the first three-position four-way reversing valve communicates with the second oil delivery port of the first three-position four-way reversing valve, and controlling the hand pump to make pressure oil flow into the tensioning oil cylinder in the rodless cavity, and the tensioning oil cylinder makes hydraulic oil in the rod cavity flow back to the first oil tank.

Specifically, when the tensioning pressure is greater than the set value, the second three-position four-way reversing valve 6 returns to the neutral position and is switched to the manual tensioning mode. And starting the manual pump 2, operating a handle of the first three-position four-way reversing valve 3 to push the valve core to move rightwards, wherein the first three-position four-way reversing valve 3 is positioned at the right position, P is communicated with A, and B is communicated with T. And pressure oil of the port A of the first three-position four-way reversing valve 3 enters a rodless cavity of the tensioning oil cylinder 1 from a port V1 of the hydraulic lock 8 through a port C1 through the first tee joint 9 to further tension the chain cutter. And the hydraulic oil of the rod cavity of the tensioning oil cylinder 1 returns to the first oil tank 4 from the V2 port of the hydraulic lock 8 through the second tee joint 10 to the B port of the second three-position four-way reversing valve 6.

It should be understood that, when the equipment completes the operation, the chain cutter needs to be disassembled, and preferably, the step S3 further includes the following steps:

s4, adjusting the first three-position four-way reversing valve, enabling an oil inlet of the first three-position four-way reversing valve to be communicated with an oil delivery port of the second three-position four-way reversing valve, enabling an oil return port of the first three-position four-way reversing valve to be communicated with an oil delivery port of the first three-position four-way reversing valve, controlling the manual pump, enabling pressure oil to flow into the tensioning oil cylinder in the rod cavity, and enabling hydraulic oil in the rodless cavity of the tensioning oil cylinder to flow back to the first oil tank.

Specifically, the manual pump 2 is started, a handle of the first three-position four-way reversing valve 3 is operated to push the valve core to move leftwards, the first three-position four-way reversing valve 3 is in the left position, P is communicated with B, and A is communicated with T. The pressure oil of the port B of the first three-position four-way reversing valve 3 enters the rod cavity of the tensioning oil cylinder 5 from the port V2 of the hydraulic lock 8 through the port C2 through the second tee joint 10, and the hydraulic oil of the rodless cavity of the tensioning oil cylinder 5 returns to the first oil tank 4 from the port V1 of the hydraulic lock 8 to the port A of the first three-position four-way reversing valve 3 through the first tee joint 9. At the moment, the piston rod retracts, the chain cutter falls off, the chain cutter can be disassembled, and the chain cutter can be disassembled manually.

Preferably, after the step S3, the method further includes the following steps:

s4, close the first three-position four-way reversing valve, adjust simultaneously the second three-position four-way reversing valve lets the oil inlet of the second three-position four-way reversing valve with the second oil delivery mouth intercommunication of the second three-position four-way reversing valve, the oil return mouth of the second three-position four-way reversing valve with the first oil delivery mouth intercommunication of the second three-position four-way reversing valve, open the hydraulic source, make pressure oil flow into the tensioning cylinder have in the pole chamber, the tensioning cylinder the hydraulic oil flow back in the rodless chamber in the second oil tank.

Specifically, the first three-position four-way reversing valve 3 returns to the neutral position. The hydraulic source 5 provides pressure oil for a hydraulic system, the electromagnet on the left side of the second three-position four-way reversing valve 6 is electrified, the valve core moves leftwards, P is communicated with B, and A is communicated with T. The pressure oil of the port B of the second three-position four-way reversing valve 6 enters the rod cavity of the tensioning oil cylinder 5 from the port V2 of the hydraulic lock 8 through the port C2 through a second tee joint 10, and the hydraulic oil of the rodless cavity of the tensioning oil cylinder 5 returns to the second oil tank 7 from the port V1 of the hydraulic lock 8 to the port A of the second three-position four-way reversing valve 6 through the first tee joint 9. At the moment, the piston rod retracts, the chain cutter falls off, the chain cutter can be disassembled, and the chain cutter can be disassembled electrically.

The chain cutter tensioning control system and the chain cutter tensioning control method of the top-cutting pressure-relief trolley provided by the embodiment are high in operation efficiency, and the looseness degree of the chain cutter can be controlled. The oil cylinder is controlled to stretch out and draw back through the electricity liquid in the initial stage, so that the adjusting time is shortened, and the tensioning efficiency can be improved. In the tensioning process of the chain cutter, the abrasion of the chain cutter can be reduced and the service life of the chain cutter can be prolonged by adjusting the loosening degree of the chain cutter according to different geological conditions. The tensioning degree of the chain cutter in the prior art is mainly judged by observing the size of a gap between the chain cutter and a chain arm by an operator. This method is affected by the operator and the observation site, and cannot accurately reflect the degree of slack of the cutter chain. In the embodiment, the extending length of the piston rod of the tensioning oil cylinder 1 is detected through the displacement sensor 11, so that the integral tensioning degree of the chain cutter is controlled. Meanwhile, under the same geological conditions, the sensor can be adjusted to design parameters, and corresponding working conditions can be met without multiple adjustments. And the whole composite tensioning system uses common hydraulic elements, and two different tensioning schemes can be realized by oil circuit switching. Meanwhile, the pressure sensor 13 and the controller 14 can monitor the working condition of the system in real time, and the safety of personnel and equipment is ensured.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.