Platform expansion interlock protection hydraulic system of anchor excavator and anchor excavator

Abstract

The present application relates to the technical field of roadway construction, and particularly relates to a platform expansion interlocking protection hydraulic system of a combined drilling and bolting machine, which comprises a load-sensitive electric proportional multi-way valve, a platform interlocking valve group, a balance valve and a platform expansion and retraction oil cylinder, the platform interlocking valve group comprises a two-position four-way manual reversing valve, a first hydraulic control check valve and a second hydraulic control check valve, the working position of the two-position four-way manual reversing valve is manually switched, a control oil source is provided for the first hydraulic control check valve and the second hydraulic control check valve, the first hydraulic control check valve and the second hydraulic control check valve are positively opened, and the main oil path of the platform expansion and retraction oil cylinder is controlled to be turned on and turned off. The present application solves the technical problem that the expansion of the anchor rod machine operating platform of the combined drilling and bolting machine in the prior art is insufficient in interlocking function realized by a manual ball valve, and avoids the harm of the operator being squeezed and the structural components being damaged.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, specifically to a platform extension interlocking protection hydraulic system for a roadheader and the roadheader itself. Background Technology

[0002] The entire construction process of the roadheader and anchor rig includes: first, the entire machine moves to the working position, where the cutting and anchoring systems operate simultaneously; then, the machine moves to the next working position, completing one cycle of operation, and then proceeding to the next cycle. During cutting and anchoring operations, the roadheader and anchor rig's operating platform needs to be extended to increase the operator's working space; conversely, during the machine's movement, the operating platform needs to be retracted. To protect operator safety and prevent damage to the working mechanism and misoperation, the roadheader and anchor rig platform extension requires an interlocking protection function to effectively prevent component damage and operator injury that may occur due to misoperation during anchoring or movement operations.

[0003] Currently, the interlock function of the roadheader's hydraulic system is switched using only a manual ball valve, which controls the hydraulic circuit of the corresponding actuator. Roadheaders operate quickly, requiring frequent operation of the manual three-way ball valve, significantly impacting the actual construction efficiency. Furthermore, the large force required to operate the ball valve increases the workload of the operators.

[0004] In summary, there is an urgent need for a system that can easily and quickly implement simple and reliable interlock control for the expansion of the tunneling and anchoring platform to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic system for platform expansion interlock protection of a roadheader and a roadheader, to solve the technical problem that the existing technology of using manual ball valves to achieve interlocking function when expanding the operating platform of a roadheader's bolting machine is insufficient. The specific technical solution is as follows:

[0006] This invention provides a platform extension interlock protection hydraulic system for a roadheader, including a load-sensitive electro-proportional multi-way valve, a platform interlock valve group, a balance valve, and a platform extension / retraction cylinder. The platform interlock valve group includes a two-position four-way manual directional valve, a first hydraulically controlled check valve, and a second hydraulically controlled check valve. The two-position four-way manual directional valve is connected to the control chambers of the first and second hydraulically controlled check valves. The two-position four-way manual directional valve, the first hydraulically controlled check valve, and the second hydraulically controlled check valve are respectively connected to the load-sensitive electro-proportional multi-way valve. The first and second hydraulically controlled check valves are respectively connected to the balance valve, which is connected to the platform extension / retraction cylinder. By manually switching the working position of the two-position four-way manual directional valve, a control oil source is provided to the first and second hydraulically controlled check valves, causing them to open in the forward direction to control the on / off of the main oil circuit of the platform extension / retraction cylinder.

[0007] A further improvement of the platform extension interlock protection hydraulic system of the tunneling and anchoring machine of the present invention is that the platform interlock valve group further includes port A1 and port B1, the first hydraulic control check valve is connected to port A1, and the second hydraulic control check valve is connected to port B1.

[0008] A further improvement of the platform extension interlock protection hydraulic system of the anchor excavator of the present invention is that the load-sensitive electro-proportional multi-way valve includes a 1P port, a 1A port and a 1B port, the 1P port is connected to the 1A port and the 1B port respectively, the 1A port is connected to the A1 port and the 1B port is connected to the B1 port.

[0009] A further improvement of the platform extension interlock protection hydraulic system of the tunneling and anchoring machine of the present invention is that the load-sensitive electro-proportional multi-way valve further includes an M port, and the platform interlock valve group further includes a 2P port, with the M port connected to the 2P port.

[0010] A further improvement of the platform extension interlock protection hydraulic system of the tunneling and anchoring machine of the present invention is that the platform interlock valve group further includes port A2 and port B2, port A2 is connected to the first hydraulic control check valve, and port B2 is connected to the second hydraulic control check valve.

[0011] A further improvement of the platform extension interlock protection hydraulic system of the tunneling and anchoring machine of the present invention is that the balance valve includes a V1 port and a V2 port, the V1 port being connected to the A2 port and the V2 port being connected to the B2 port.

[0012] A further improvement of the platform extension interlock protection hydraulic system of the present invention for the tunneling and anchoring machine is that the platform extension and retraction cylinder includes a rodless chamber and a rod chamber. The rodless chamber is connected to the V1 port through a first pipeline, and the rod chamber is connected to the V2 port through a second pipeline.

[0013] The present invention also provides a bolting machine, including a platform extension interlock protection hydraulic system as described above to control the extension and retraction actions of the bolting machine operating platform.

[0014] The application of the technical solution of the present invention has the following beneficial effects:

[0015] This invention relates to a hydraulic system for the platform extension and interlock protection of a bolting rig. By simultaneously moving a load-sensitive electro-proportional multi-way valve and a platform interlock valve assembly, it achieves an interlock protection function for the extension and retraction of the bolting rig's operating platform. This solves the technical problem of insufficient interlocking function in existing bolting rigs where the extension of the operating platform is achieved using a manual ball valve, thus avoiding hazards such as operator injury from compression and damage to structural components. Both the load-sensitive electro-proportional multi-way valve and the platform interlock valve assembly of this invention are self-resetting directional valves, thereby controlling the on / off state of the working oil circuit of the actuator. Simultaneously, by operating the handle of the electro-proportional load-sensitive multi-way valve, the platform extension and retraction actions are achieved. The system is reliable, simple and convenient to operate, and reduces operator fatigue.

[0016] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the platform extension interlock protection hydraulic system of the tunneling and anchoring machine of the present invention;

[0019] Figure 2 This is an enlarged view of the platform interlock valve group of the platform extension interlock protection hydraulic system of the tunneling and anchoring machine of the present invention.

[0020] Among them, 1. Load-sensitive electro-proportional multi-way valve; 2. Platform interlock valve group; 2.1. Two-position four-way manual directional valve; 2.2. First hydraulically controlled check valve; 2.3. Second hydraulically controlled check valve; 3. Balance valve; 4. Platform extension and retraction cylinder; 5. Rodless chamber; 6. Rod chamber. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] See Figure 1 and Figure 2As shown, a platform extension interlock protection hydraulic system for a roadheader includes a load-sensitive electro-proportional multi-way valve 1, a platform interlock valve group 2, a balance valve 3, and a platform extension / retraction cylinder 4. The platform interlock valve group 2 includes a two-position four-way manual directional valve 2.1, a first hydraulically controlled check valve 2.2, and a second hydraulically controlled check valve 2.3. The two-position four-way manual directional valve 2.1 is connected to the control chamber of the first hydraulically controlled check valve 2.2 and the control chamber of the second hydraulically controlled check valve 2.3. The two-position four-way manual directional valve 2.1, the first hydraulically controlled check valve 2.2, and the second hydraulically controlled check valve 2.3... Two hydraulically controlled check valves 2.3 are respectively connected to the load-sensitive electro-proportional multi-way valve 1. The first hydraulically controlled check valve 2.2 and the second hydraulically controlled check valve 2.3 are respectively connected to the balance valve 3. The balance valve 3 is connected to the platform extension and retraction cylinder 4. By manually switching the working position of the two-position four-way manual directional valve 2.1, control oil is provided to the first hydraulically controlled check valve 2.2 and the second hydraulically controlled check valve 2.3, so that the first hydraulically controlled check valve 2.2 and the second hydraulically controlled check valve 2.3 open in the forward direction to control the on / off of the main oil circuit of the platform extension and retraction cylinder 4.

[0023] The interlock function of the hydraulic system of the roadheader requires frequent operation of the manual three-way ball valve, resulting in high workload for operators. Due to the rapid pace of roadheader construction and the frequent platform extension and retraction movements, this high workload impacts the efficiency of the roadheader and also poses safety hazards. Because the manual ball valve controls the oil circuit of the actuator, the harsh conditions and low visibility in underground coal mines, coupled with the tedious nature of the work, increase the likelihood of forgetting to close the ball valve, leading to increased accidental operation, which in turn increases the risk of worker injury and component damage. Furthermore, the manual ball valve's mode switching complicates the overall piping layout, increasing maintenance and troubleshooting time. The operator's frequent opening and closing of the ball valve for switching severely impacts work efficiency.

[0024] The function of the load-sensitive electro-proportional multi-way valve 1 is to change the direction of the oil circuit, thereby controlling the extension or retraction of the platform extension and retraction cylinder 4.

[0025] The function of the two-position four-way manual directional valve 2.1 is to provide control oil to the first hydraulic control check valve 2.2 and the second hydraulic control check valve 2.3 by manually switching the working position, so that the first hydraulic control check valve 2.2 and the second hydraulic control check valve 2.3 open in the forward direction, thereby realizing the on-off control of the main oil circuit of the actuator.

[0026] The function of the first hydraulic check valve 2.2 and the second hydraulic check valve 2.3 is to control the opening and closing of the main oil circuit of the actuator.

[0027] The function of the balance valve 3 is to lock the structural components stationary under static working conditions when the platform extension and retraction cylinder 4 is in a static state.

[0028] The platform extension and retraction cylinder 4 functions by extending and retracting the platform.

[0029] The load-sensitive electro-proportional multi-way valve 1 and platform interlock valve group 2 of this invention are manual self-resetting directional valves that can control the on / off of the working oil circuit of the actuator. At the same time, by operating the handle of the electro-proportional load-sensitive multi-way valve, the platform extension and retraction actions are realized. Compared with the control of multiple ball valves in the prior art, it is more reliable, simple and convenient to operate, and reduces the intensity of operation. The platform interlock valve group 2 adopts a threaded cartridge integrated valve group form, which has a high degree of integration, uniform oil port orientation, simple pipeline layout, and convenient maintenance. The entire hydraulic system is small in size and can be installed on the side of the anchor bolt machine operating platform and fixed with screws, making installation and operation convenient.

[0030] Preferably, the platform interlock valve group 2 further includes ports A1 and B1. The first hydraulically controlled check valve 2.2 is connected to port A1, and the second hydraulically controlled check valve 2.3 is connected to port B1. Both the first hydraulically controlled check valve 2.2 and the second hydraulically controlled check valve 2.3 are check valves. Pressure oil from port A1 to the first hydraulically controlled check valve 2.2 cannot pass through it, while pressure oil from the first hydraulically controlled check valve 2.2 to port A1 can pass through it. Similarly, pressure oil from port B1 to the second hydraulically controlled check valve 2.3 cannot pass through it, while pressure oil from the second hydraulically controlled check valve 2.3 to port B1 can pass through it. The platform interlock valve group 2 also includes a 2T port, which is a drain port connected to the hydraulic oil tank.

[0031] Preferably, the load-sensitive electro-proportional multi-way valve 1 includes a 1P port, a 1A port, and a 1B port. The 1P port is connected to both the 1A and 1B ports, the 1A port is connected to the A1 port, and the 1B port is connected to the B1 port. The 1P port is an oil inlet, allowing pressurized oil to flow to both the 1A and 1B ports. This load-sensitive electro-proportional multi-way valve 1 is an existing valve, model PSV4S1, and its specific structure will not be described in detail. The load-sensitive electro-proportional multi-way valve 1 also includes a 1T port, which is a return port connected to the hydraulic oil tank.

[0032] Preferably, the load-sensitive electro-proportional multi-way valve 1 further includes an M port, and the platform interlock valve assembly 2 further includes a 2P port, with the M port connected to the 2P port. Pressure oil can flow from the M port to the 2P port.

[0033] Furthermore, the two-position four-way manual directional valve 2.1 includes port 2A and port 2B. Port 2A corresponds to the upper working state. When the upper working state is in operation, port 2P is connected to port 2A, but port 2A is not connected to the first hydraulic check valve 2.2 and the second hydraulic check valve 2.3, so the platform cannot be extended or retracted. Port 2B corresponds to the lower working state. When the lower working state is in operation, port 2P is connected to port 2B, and port 2B is connected to the first hydraulic check valve 2.2 and the second hydraulic check valve 2.3, so the platform can be extended or retracted.

[0034] Preferably, the platform interlock valve assembly 2 further includes ports A2 and B2. Port A2 is connected to the first hydraulic check valve 2.2, and port B2 is connected to the second hydraulic check valve 2.3. When the two-position four-way manual directional valve 2.1 is in its lower position, the pressure oil can flow through port 2P to port 2B, and then from port 2B to port A2 or from port 2B to port B2.

[0035] Preferably, the balancing valve 3 includes a V1 port and a V2 port, with the V1 port connected to the A2 port and the V2 port connected to the B2 port. The balancing valve 3 can be connected to the platform interlock valve assembly 2 through the V1 and V2 ports.

[0036] Preferably, the platform extension / retraction cylinder 4 includes a rodless chamber 5 and a rod chamber 6. The rodless chamber 5 is connected to port V1 via a first pipeline, and the rod chamber 6 is connected to port V2 via a second pipeline. The pressure and oil volume of the rodless chamber 5 and the rod chamber 6 can control the extension and retraction of the platform extension / retraction cylinder 4, thereby realizing the expansion and retraction of the operating platform.

[0037] The present invention also provides a bolting machine, including a platform extension interlock protection hydraulic system as described above to control the extension and retraction actions of the bolting machine operating platform.

[0038] The working principle of this invention is divided into the platform expansion interlock protection working principle and the platform recovery interlock protection working principle:

[0039] Platform extended interlock protection working principle: When the system oil reaches port 1P of the load-sensitive electro-proportional multi-way valve 1, the handle of the load-sensitive electro-proportional multi-way valve 1 is moved to its lower position. The pressurized oil passes through the lower position of the load-sensitive electro-proportional multi-way valve 1 to port 1A. The pressurized oil at port 1A passes through the pipeline to port A1 of the platform interlock valve group, where it is blocked in the reverse direction by the first hydraulically controlled check valve 2.2. At the same time, the handle of the two-position four-way directional valve 2.1 must be moved to its lower position to connect port 2P and port 2B. The pressurized oil at port M of the load-sensitive electro-proportional multi-way valve 1 passes through port 2B of the two-position four-way directional valve 2.1 to the control chambers of the first hydraulic check valve 2.2 and the second hydraulic check valve 2.3, causing the first hydraulically controlled check valve 2.2 to open in the forward direction. The pressurized oil at port A1 of the platform interlock valve group passes through the first hydraulically controlled check valve 2.2 to port A2 of the platform interlock valve group 2. The pressure oil at port A1 of the platform interlock valve group 2 passes through the first hydraulically controlled check valve 2.2 to port A2 of the platform interlock valve group 2. Two pressure oil ports travel through pipelines to the balance valve V1 port, then through the balance valve 3, and finally to the rodless chamber 5 of the platform extension / retraction cylinder 4. This increases the oil level in the rodless chamber 5, causing the piston of the platform extension / retraction cylinder 4 to move towards the rod chamber 6. The oil in the rod chamber 6 then travels through the balance valve 3 to the balance valve V2 port, through pipelines to the platform interlock valve group B2 port, and through the second hydraulic check valve 2.3 to the platform interlock valve group B1 port. The oil from port B1 of the platform interlock valve group 2 travels through pipelines to the load-sensitive electro-proportional multi-way valve 1 (port 1B), and then returns to the hydraulic oil tank via the lower position of the load-sensitive electro-proportional multi-way valve 1. This creates a circulation, allowing the platform extension / retraction cylinder 4 to extend the platform. During this process, the handles of the two-position four-way directional valve 2.1 in the platform interlock valve group 2 and the load-sensitive proportional multi-way valve 1 must be moved simultaneously to achieve the platform extension action. Neither can be omitted, thus realizing the platform extension interlock protection function.

[0040] Platform retraction interlock protection working principle: When the system oil reaches port 1P of the load-sensitive electro-proportional multi-way valve 1, moving the handle of the load-sensitive electro-proportional multi-way valve 1 to its upper position allows the pressurized oil to reach port 1B through the upper position of the load-sensitive electro-proportional multi-way valve 1. The pressurized oil at port 1B then travels through the pipeline to port B1 of the platform interlock valve group, where it is reverse-cut off by the second hydraulically controlled check valve 2.3. At the same time, the handle of the two-position four-way directional valve 2.1 must be moved to its lower position to connect port 2P and port 2B. The pressurized oil at port M of the load-sensitive electro-proportional multi-way valve 1 travels through the lower position of the two-position four-way directional valve 2.1 to the control chambers of the first hydraulic check valve 2.2 and the second hydraulic check valve 2.3, causing the second hydraulically controlled check valve 2.3 to open in the forward direction. The pressurized oil at port B1 of the platform interlock valve group 2 travels through the second hydraulically controlled check valve 2.3 to port B2 of the platform interlock valve group 2. The pressure oil at port B2 travels through the pipeline to port V2 of the balance valve 3. After passing through the balance valve 3, it reaches the rod chamber 6 of the platform extension / retraction cylinder 4, increasing the oil volume in the rod chamber 6. This causes the oil in the rodless chamber 5 of the platform extension / retraction cylinder 4 to travel through the balance valve 3 to port V1, then through the pipeline to port A2 of the platform interlock valve group 2. Through the first hydraulic check valve 2.2, it reaches port A1 of the platform interlock valve group 2. The oil at port A1 of the platform interlock valve group 2 travels through the pipeline to port 1A of the load-sensitive electro-proportional multi-way valve 1, and then returns to the hydraulic oil tank through the upper position of the load-sensitive electro-proportional multi-way valve 1, forming a circulation. The platform extension / retraction cylinder 4 retracts, and the platform retracts. During this process, the handles of the two-position four-way directional valve 2.1 in the platform interlock valve group 2 and the load-sensitive proportional multi-way valve 1 must be moved simultaneously to achieve the platform retraction action. Neither can be omitted, thus realizing the platform extension interlock protection function.

[0041] This invention relates to a hydraulic system for the platform extension and interlock protection of a bolting rig. By simultaneously moving a load-sensitive electro-proportional multi-way valve and a platform interlock valve assembly, it achieves an interlock protection function for the extension and retraction of the bolting rig's operating platform. This solves the technical problem of insufficient interlocking function in existing bolting rigs where the extension of the operating platform is achieved using a manual ball valve, thus avoiding hazards such as operator injury from compression and damage to structural components. Both the load-sensitive electro-proportional multi-way valve and the platform interlock valve assembly of this invention are self-resetting directional valves, thereby controlling the on / off state of the working oil circuit of the actuator. Simultaneously, by operating the handle of the electro-proportional load-sensitive multi-way valve, the platform extension and retraction actions are achieved. The system is reliable, simple and convenient to operate, and reduces operator fatigue.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A platform extension interlock protection hydraulic system for a roadheader, characterized in that, The system includes a load-sensitive electro-proportional multi-way valve (1), a platform interlock valve group (2), a balance valve (3), and a platform extension / retraction cylinder (4). The platform interlock valve group (2) includes a two-position four-way manual directional valve (2.1), a first hydraulically controlled check valve (2.2), and a second hydraulically controlled check valve (2.3). The two-position four-way manual directional valve (2.1) is connected to the control chamber of the first hydraulically controlled check valve (2.2) and the control chamber of the second hydraulically controlled check valve (2.3). The two-position four-way manual directional valve (2.1), the first hydraulically controlled check valve (2.2), and the second hydraulically controlled check valve (2.3) are respectively... The first hydraulic check valve (2.2) and the second hydraulic check valve (2.3) are connected to the load-sensitive proportional multi-way valve (1), and the balance valve (3) is connected to the platform extension and retraction cylinder (4). By manually switching the working position of the two-position four-way manual directional valve (2.1), the first hydraulic check valve (2.2) and the second hydraulic check valve (2.3) are provided with control oil, so that the first hydraulic check valve (2.2) and the second hydraulic check valve (2.3) are opened in the positive direction to control the main oil circuit of the platform extension and retraction cylinder (4).

2. The platform extension interlock protection hydraulic system for the roadheader according to claim 1, characterized in that, The platform interlock valve group (2) further includes port A1 and port B1. The first hydraulic control check valve (2.2) is connected to port A1, and the second hydraulic control check valve (2.3) is connected to port B1.

3. The platform extension interlock protection hydraulic system for the roadheader according to claim 2, characterized in that, The load-sensitive electro-proportional multi-way valve (1) includes a 1P port, a 1A port and a 1B port. The 1P port is connected to the 1A port and the 1B port respectively. The 1A port is connected to the A1 port and the 1B port is connected to the B1 port.

4. The platform extension interlock protection hydraulic system for the roadheader according to claim 1, characterized in that, The load-sensitive electro-proportional multi-way valve (1) also includes an M port, and the platform interlock valve group (2) also includes a 2P port, with the M port connected to the 2P port.

5. The platform extension interlock protection hydraulic system for the roadheader according to claim 1, characterized in that, The platform interlock valve group (2) also includes port A2 and port B2. Port A2 is connected to the first hydraulic control check valve (2.2), and port B2 is connected to the second hydraulic control check valve (2.3).

6. The platform extension interlock protection hydraulic system for the roadheader according to claim 5, characterized in that, The balancing valve (3) includes a V1 port and a V2 port, the V1 port being connected to the A2 port and the V2 port being connected to the B2 port.

7. The platform extension interlock protection hydraulic system for the roadheader according to claim 6, characterized in that, The platform extension and retraction cylinder (4) includes a rodless chamber (5) and a rod chamber (6). The rodless chamber (5) is connected to the V1 port through a first pipeline, and the rod chamber (6) is connected to the V2 port through a second pipeline.

8. A roadheader, characterized in that, The system includes a platform extension interlock protection hydraulic system for the bolting machine as described in claim 1 to control the extension and retraction movements of the bolting machine operating platform.

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