Hydraulic control valve for the integral telescopic mechanism of a roadheader

Abstract

The present invention discloses a hydraulic control valve for the integral telescopic mechanism of a roadheader, which comprises a main valve body. The oil inlets A - D of the main valve body 1 are respectively connected to the inlets of the first - fourth one - way valves. The outlets of the first - fourth one - way valves are all communicated with the second hydraulic control reversing valve. The other port of the second hydraulic control reversing valve is communicated with the oil outlet E, the oil inlet of the first overflow valve, and the closed end of the hydraulic control one - way valve. The opening end of the hydraulic control one - way valve is communicated with the oil inlet of the second overflow valve, and the control port is communicated with the control port G of the main valve body. The first shuttle valve is respectively connected between the oil inlet A of the main valve body and the first one - way valve, and between the oil inlet B and the second one - way valve. The third shuttle valve is respectively connected between the oil inlet C of the main valve body and the third one - way valve, and between the oil inlet D and the fourth one - way valve. The second shuttle valve is respectively connected to the outlets of the first shuttle valve and the third shuttle valve. The outlet of the second shuttle valve is communicated with the oil inlet of the sequence valve. The outlet of the sequence valve is communicated with the control port of the first hydraulic control reversing valve and the control port of the second hydraulic control reversing valve. The X1 port of the first hydraulic control reversing valve is communicated with the oil inlet F1 of the main valve body, the X2 port is communicated with the oil outlet F2 of the main valve body, and the X3 port is communicated with the drain port of the sequence valve, the outlet of the first overflow valve, the outlet of the second overflow valve, and the drain port T of the main valve body. The hydraulic control valve for the integral telescopic mechanism of the roadheader of the present invention can realize the high - degree integration of the hydraulic system, save space, simplify operation, and reduce the failure rate.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic control of coal mine mechanical equipment, and particularly relates to a hydraulic control valve for the integral telescopic mechanism of a roadheader. Background Art

[0002] For the traditional telescopic mechanism of the cutting part of a roadheader, the cutting arm has a short-distance telescopic movement, and it is easy to cause the wear of the connecting key and the deformation and failure of the mechanism due to large external forces and vibrations, etc., resulting in low reliability. For the roadheader with the integral telescopic form of the cutting part, the stability and reliability of cutting are improved. When the cutting pressure is relatively small, the lifting, slewing and telescopic actions of the cutting part can be carried out simultaneously. When cutting semi-coal rock and hard rock, the pressure of the lifting and slewing actions of the cutting is relatively large, and the telescopic mechanism is pressed by the parallel compression oil cylinder group to avoid jitter, or the cutting telescopic action is carried out separately. If multiple hydraulic valves are selected and connected through pipelines to control the hydraulic system of the integral telescopic mechanism of the roadheader, there will inevitably be problems such as complex pipelines, many fault points, large occupied space and inconvenient operation. Summary of the Invention

[0003] The purpose of the invention is to design a hydraulic control valve for the integral telescopic mechanism of the cutting part of a roadheader, so as to realize that when the cutting pressure is relatively small, the lifting, slewing and telescopic actions of the cutting part can be carried out simultaneously. When the pressure of the lifting and slewing actions of the cutting is relatively large, the parallel compression oil cylinder group automatically presses the telescopic mechanism to make it unable to expand and contract, avoiding jitter.

[0004] The present invention provides a hydraulic control valve for the integral telescopic mechanism of a roadheader, which includes a main valve body, a first shuttle valve, a second shuttle valve, a third shuttle valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a sequence valve, a first hydraulically controlled directional valve, a second hydraulically controlled directional valve, a hydraulically controlled check valve, a first relief valve, and a second relief valve. The main valve body is provided with an oil inlet A, an oil inlet B, an oil inlet C, an oil inlet D, an oil outlet E, an oil inlet F1, an oil outlet F2, a control port G, and a drain port T. The oil inlets A, B, C, and D of the main valve body are respectively connected to the inlets of the first check valve, the second check valve, the third check valve, and the fourth check valve. The outlets of the first check valve, the second check valve, the third check valve, and the fourth check valve are all communicated with the second hydraulically controlled directional valve. The other port of the second hydraulically controlled directional valve is communicated with the oil outlet E, the inlet of the first relief valve, and the closed end of the hydraulically controlled check valve. The opening end of the hydraulically controlled check valve is communicated with the inlet of the second relief valve, and the control port is communicated with the control port G of the main valve body. The first shuttle valve is respectively connected between the oil inlet A of the main valve body and the first check valve, and between the oil inlet B and the second check valve. The third shuttle valve is respectively connected between the oil inlet C of the main valve body and the third check valve, and between the oil inlet D and the fourth check valve. The second shuttle valve is respectively connected to the outlets of the first shuttle valve and the third shuttle valve. The outlet of the second shuttle valve is communicated with the inlet of the sequence valve. The outlet of the sequence valve is communicated with the control port of the first hydraulically controlled directional valve and the control port of the second hydraulically controlled directional valve. The X1 port of the first hydraulically controlled directional valve is communicated with the oil inlet F1 of the main valve body, the X2 port is communicated with the oil outlet F2 of the main valve body, and the X3 port is communicated with the drain port of the sequence valve, the outlet of the first relief valve, the outlet of the second relief valve, and the drain port T of the main valve body.

[0005] Further, the oil inlet A, the oil inlet B, the oil inlet C, the oil inlet D, the oil outlet E, the oil inlet F1, the oil outlet F2, the control port G, and the drain port T provided on the main valve body are located on the same end face of the main valve body.

[0006] Further, the first hydraulically controlled directional valve is a two-position three-way directional valve. Under normal conditions, the X1 port is communicated with the X2 port, and after commutation, the X2 port is communicated with the X3 port.

[0007] Further, the second hydraulically controlled directional valve is a normally closed two-position two-way directional valve, and it is communicated after commutation.

[0008] Further, the sequence valve is of the internal control and external drain type. The first relief valve is set as a high-pressure relief valve to play a protective role, and the second relief valve is set as a low-pressure relief valve to play a backpressure role.

[0009] Further, the pressures of the sequence valve, the first relief valve, and the second relief valve are adjustable.

[0010] Further, the oil inlets A, B, C, and D on the main valve body are respectively connected to introduce hydraulic oil from the rod chambers and non-rod chambers of the left and right cutting lifting cylinders and the left and right cutting slewing cylinders; the oil outlet E on the main valve body is connected to the oil inlet of the parallel compression cylinder group; the oil inlet F1 on the main valve body is connected to the pilot oil supply source of the roadheader, and the oil outlet F2 on the main valve body is connected to the oil inlet of the telescopic control handle; the control port G on the main valve body is connected to introduce hydraulic oil from the rod chambers and non-rod chambers of the cutting telescopic cylinder; the oil drain port T on the main valve body is connected to the oil return tank.

[0011] Further, an observation port M is provided on the main valve body, and the other port of the first hydraulic control reversing valve communicates with the observation port M.

[0012] Further, the observation port M on the main valve body is connected to a pressure gauge.

[0013] Further, when the overall telescopic mechanism needs to disassemble the equipment, check the pressure value of the pressure gauge connected to the observation port M of the main valve body, operate the cutting telescopic cylinder or supply liquid to the control port G of the main valve body to discharge the pressure through the second overflow valve. After the pressure value of the pressure gauge at the M port drops to the set pressure value of the second overflow valve, then adjust the pressure value of the first overflow valve to the lowest, operate the cutting telescopic cylinder or supply liquid to the control port G of the main valve body, observe that the pressure value of the pressure gauge at the M port approaches zero, and then slowly remove the pipeline.

[0014] The present invention integrates multiple control logic valves into one, occupying a small space, having simple connecting pipelines, and being easy to maintain. When the cutting pressure is small, the cutting part can perform lifting, slewing, and telescopic actions simultaneously; when encountering an object with a greater cutting hardness, the telescopic function is automatically locked, and the parallel compression cylinder group compresses the telescopic mechanism to avoid jitter, or the telescopic function can be used alone for grooving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the hydraulic schematic diagram of the hydraulic control valve for the overall telescopic mechanism of the roadheader of the present invention;

[0016] Figure 2 is the hydraulic connection schematic diagram of the hydraulic control valve for the overall telescopic mechanism of the roadheader of the present invention;

[0017] Figure 3 is the left axonometric view of the hydraulic control valve for the overall telescopic mechanism of the roadheader of the present invention;

[0018] Figure 4 is the right axonometric view of the hydraulic control valve for the overall telescopic mechanism of the roadheader of the present invention;

[0019] Figure 5 is the front view of the hydraulic control valve for the overall telescopic mechanism of the roadheader of the present invention.

[0020] In the figure: 1 - main valve body, 2 - first shuttle valve, 3 - second shuttle valve, 4 - third shuttle valve, 5-1 - first check valve, 5-2 - second check valve, 5-3 - third check valve, 5-4 - fourth check valve, 6 - sequence valve, 7 - first hydraulically controlled directional valve, 8 - second hydraulically controlled directional valve, 9 - hydraulically controlled check valve, 10 - first relief valve, 11 - second relief valve, 12 - cutting lifting oil cylinder, 13 - cutting slewing oil cylinder, 14 - cutting telescopic oil cylinder, 15 - parallel compression oil cylinder group. Detailed implementation mode

[0021] In order to better understand the purpose, structure and function of the present invention, the following further describes in detail a hydraulic control valve for the overall telescopic mechanism of a roadheader in conjunction with the accompanying drawings.

[0022] As Figures 1 to 5 shown, a hydraulic control valve for the overall telescopic mechanism of a roadheader includes a main valve body 1, a first shuttle valve 2, a second shuttle valve 3, a third shuttle valve 4, a first check valve 5-1, a second check valve 5-2, a third check valve 5-3, a fourth check valve 5-4, a sequence valve 6, a first hydraulically controlled directional valve 7, a second hydraulically controlled directional valve 8, a hydraulically controlled check valve 9, a first relief valve 10, and a second relief valve 11. An oil inlet A, an oil inlet B, an oil inlet C, an oil inlet D, an oil outlet E, an oil inlet F1, an oil outlet F2, a control port G, an observation port M and a drain port T are arranged on the main valve body 1. The oil inlets A, B, C, and D of the main valve body 1 are respectively connected to the inlets of the first check valve 5-1, the second check valve 5-2, the third check valve 5-3, and the fourth check valve 5-4. The outlets of the first check valve 5-1, the second check valve 5-2, the third check valve 5-3, and the fourth check valve 5-4 are all communicated with the second hydraulically controlled directional valve 8. The other port of the second hydraulically controlled directional valve 8 is communicated with the oil outlet E, the observation port M, the inlet of the first relief valve 10, and the closed end of the hydraulically controlled check valve 9. The opening end of the hydraulically controlled check valve 9 is communicated with the inlet of the second relief valve 11, and the control port is communicated with the control port G of the main valve body 1. The first shuttle valve 2 is respectively connected between the oil inlet A of the main valve body 1 and the first check valve 5-1, and between the oil inlet B and the second check valve 5-2. The third shuttle valve 4 is respectively connected between the oil inlet C of the main valve body 1 and the third check valve 5-3, and between the oil inlet D and the fourth check valve 5-4. The second shuttle valve 3 is respectively connected to the outlets of the first shuttle valve 2 and the third shuttle valve 4. The outlet of the second shuttle valve 3 is communicated with the inlet of the sequence valve 6. The outlet of the sequence valve 6 is communicated with the control port of the first hydraulically controlled directional valve 7 and the control port of the second hydraulically controlled directional valve 8. The X1 port of the first hydraulically controlled directional valve 7 is communicated with the oil inlet F1 of the main valve body 1, the X2 port is communicated with the oil outlet F2 of the main valve body 1, and the X3 port is communicated with the drain port of the sequence valve 6, the outlet of the first relief valve 10, the outlet of the second relief valve 11, and the drain port T of the main valve body 1.

[0023] In this embodiment, the sequence valve 6 is of the internally piloted and externally drained type, and its pressure is generally set to 10 Mpa; the first hydraulically controlled directional valve 7 is a two-position three-way directional valve. Under normal conditions, port X1 communicates with port X2, and after switching, port X2 communicates with port X3; the second hydraulically controlled directional valve 8 is a normally closed two-position two-way directional valve, which is connected after switching; the first relief valve 10 is adjusted to be a high-pressure relief valve, generally 25 Mpa, which plays a protective role; the second relief valve 11 is adjusted to be a low-pressure relief valve, generally 3 Mpa, which plays a backpressure role. The pressures of the sequence valve 6, the first relief valve 10, and the second relief valve 11 are adjustable and need to be adjusted in real time according to different machine models and the actual situation of the roadway. For the convenience of understanding in this patent, the general adjusted pressure values are set here.

[0024] The oil inlets A, B, C, and D on the main valve body 1 are respectively led out from the rod-side chambers and rodless-side chambers of the left and right cutting lifting cylinders 12 and the left and right cutting slewing cylinders 13; the oil outlet E on the main valve body 1 is connected to the oil inlet of the parallel clamping cylinder group 15; the oil inlet F1 on the main valve body 1 is connected to the pilot oil supply source of the roadheader, and the oil outlet F2 on the main valve body 1 is connected to the oil inlet of the telescopic control handle; the control port G on the main valve body 1 is led out from the rod-side chambers and rodless-side chambers of the cutting telescopic cylinder 14; the observation port M on the main valve body 1 is connected to a pressure gauge for easy observation; the drain port T on the main valve body 1 is connected to the oil tank.

[0025] When the cutting pressure is relatively small, the cutting part can perform lifting and slewing actions and telescopic actions simultaneously; when encountering objects with greater cutting hardness, the telescopic function is automatically locked, and the parallel clamping cylinder group 15 compresses the telescopic mechanism to avoid jitter, or the telescopic function can be used alone for cutting a groove.

[0026] Working process: When cutting a relatively soft coal seam, the working oil circuits of the cutting lifting cylinder 12 and the cutting slewing cylinder 13 are connected to the oil inlets A, B, C, and D of the main valve body 1. Since the oil pressure is relatively low, the sequence valve 6 cannot be opened through the first shuttle valve 2, the second shuttle valve 3, and the third shuttle valve 4, that is, the second hydraulically controlled directional valve 8 cannot be connected, and port X1 and port X2 of the first hydraulically controlled directional valve 7 communicate. The pilot oil supply source of the roadheader supplies the telescopic control handle through the oil inlet F1 and the oil outlet F2 of the main valve body 1. When the cutting telescopic cylinder 14 acts, the oil at the control port G of the main valve body 1 enters, causing the hydraulic check valve 9 to open. The pressure of the parallel clamping cylinder group 15 is the set value of the second relief valve 11, enabling the slide rails of the overall telescopic mechanism to move smoothly in the track without excessive resistance.

[0027] When the hardness of the cutting object increases, the pressure of the working oil circuits of the cutting lifting oil cylinder 12 and the cutting slewing oil cylinder 13 increases. The high-pressure hydraulic oil at the oil inlets A, B, C, and D of the main valve body 1 passes through the first shuttle valve 2, the second shuttle valve 3, and the third shuttle valve 4 to open the sequence valve 6, and then reaches the control ports of the first pilot-operated directional valve 7 and the second pilot-operated directional valve 8, causing the first pilot-operated directional valve 7 to change the direction so that the X2 port communicates with the X3 port, cutting off the oil supply to the telescopic control handle and making the cutting telescopic oil cylinder 14 unable to operate. At the same time, the second pilot-operated directional valve 8 opens, and the high-pressure oil passes through the oil outlet E of the main valve block 1 and enters the parallel compression oil cylinder group 15 to compress the slide rail of the overall telescopic mechanism to avoid vibration. Or when the hardness of the cutting object increases, only the telescopic grooving action is carried out alone. After the cutting lifting oil cylinder 12 and the cutting slewing oil cylinder 13 stop operating, the first pilot-operated directional valve 7 returns to its normal state. The telescopic control handle can be operated to control the cutting telescopic oil cylinder 14 to operate. The oil at the control port G of the main valve body 1 enters, causing the pilot-operated check valve 9 to open, and the pressure in the parallel compression oil cylinder group 15 decreases, and the slide rail can move in the track.

[0028] When the overall telescopic mechanism needs to disassemble the equipment, the process is as follows: Check the pressure value of the pressure gauge connected to the observation port M of the main valve body 1. Operate the cutting telescopic oil cylinder 14 or supply liquid to the control port G of the main valve body 1 to discharge the pressure through the second relief valve 11. After observing that the pressure value of the pressure gauge at the M port decreases to 3 Mpa, then adjust the pressure value of the first relief valve 10 to the lowest. Operate the cutting telescopic oil cylinder 14 or supply liquid to the control port G of the main valve body 1, observe that the pressure value of the pressure gauge at the M port is close to zero, and then slowly remove the pipeline.

[0029] The hydraulic control valve of the overall telescopic mechanism of the roadheader of the present invention can achieve a high degree of integration of the hydraulic system, save space, simplify operation, and reduce the failure rate.

[0030] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A hydraulic control valve for the integral telescopic mechanism of a roadheader, characterized in that, It includes a main valve body, a first shuttle valve, a second shuttle valve, a third shuttle valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a sequence valve, a first hydraulically controlled directional valve, a second hydraulically controlled directional valve, a hydraulically controlled check valve, a first relief valve, and a second relief valve. An oil inlet A, an oil inlet B, an oil inlet C, an oil inlet D, an oil outlet E, an oil inlet F1, an oil outlet F2, a control port G, and a drain port T are provided on the main valve body. The oil inlets A, B, C, and D of the main valve body are respectively connected to the inlets of the first check valve, the second check valve, the third check valve, and the fourth check valve. The outlets of the first check valve, the second check valve, the third check valve, and the fourth check valve are all communicated with the second hydraulically controlled directional valve. The other port of the second hydraulically controlled directional valve is communicated with the oil outlet E, the inlet of the first relief valve, and the closed end of the hydraulically controlled check valve. The opening end of the hydraulically controlled check valve is communicated with the inlet of the second relief valve, and the control port is communicated with the control port G of the main valve body. The first shuttle valve is respectively connected between the oil inlet A of the main valve body and the first check valve, and the oil inlet B and the second check valve. The third shuttle valve is respectively connected between the oil inlet C of the main valve body and the third check valve, and the oil inlet D and the fourth check valve. The second shuttle valve is respectively connected to the outlets of the first shuttle valve and the third shuttle valve. The outlet of the second shuttle valve is communicated with the inlet of the sequence valve. The outlet of the sequence valve is communicated with the control port of the first hydraulically controlled directional valve and the control port of the second hydraulically controlled directional valve. The X1 port of the first hydraulically controlled directional valve is communicated with the oil inlet F1 of the main valve body, the X2 port is communicated with the oil outlet F2 of the main valve body, and the X3 port is communicated with the drain port of the sequence valve, the outlet of the first relief valve, the outlet of the second relief valve, and the drain port T of the main valve body.

2. The hydraulic control valve for the integral telescopic mechanism of the roadheader according to claim 1, characterized in that The oil inlets A, B, C, D, the oil outlet E, the oil inlet F1, the oil outlet F2, the control port G, and the drain port T provided on the main valve body are located on the same end face of the main valve body.

3. The hydraulic control valve of the overall telescopic mechanism of the roadheader according to claim 1, characterized in that, The first hydraulically controlled directional valve is a two-position three-way directional valve. Under normal conditions, the X1 port is communicated with the X2 port, and after commutation, the X2 port is communicated with the X3 port.

4. The hydraulic control valve of the integral telescopic mechanism of the roadheader according to claim 1, characterized in that, The second hydraulically controlled directional valve is a normally closed two-position two-way directional valve and is communicated after commutation.

5. The hydraulic control valve of the integral telescopic mechanism of the roadheader according to claim 1, characterized in that The sequence valve is of the internal control and external drain type. The first relief valve is set as a high-pressure relief valve to play a protective role, and the second relief valve is set as a low-pressure relief valve to play a backpressure role.

6. The hydraulic control valve of the overall telescopic mechanism of the roadheader according to claim 5, characterized in that The pressures of the sequence valve, the first relief valve, and the second relief valve are adjustable.

7. The hydraulic control valve for the integral telescopic mechanism of the roadheader according to any one of claims 1 to 6, characterized in that The oil inlets A, B, C, D on the main valve body respectively draw oil from the rod chambers and non-rod chambers of the left and right cutting lifting cylinders and the left and right cutting slewing cylinders and are connected. The oil outlet E on the main valve body is connected to the inlet of the parallel compression cylinder group. The oil inlet F1 on the main valve body is connected to the pilot oil supply source of the roadheader, and the oil outlet F2 on the main valve body is connected to the inlet of the telescopic control handle. The control port G on the main valve body draws oil from the rod chambers and non-rod chambers of the cutting telescopic cylinder and is connected. The drain port T on the main valve body is connected to the oil return tank.

8. The hydraulic control valve of the overall telescopic mechanism of the roadheader according to claim 1, characterized in that, An observation port M is provided on the main valve body, and the other port of the first hydraulically controlled directional valve is communicated with the observation port M.

9. The hydraulic control valve of the overall telescopic mechanism of the roadheader according to claim 8, wherein The observation port M on the main valve body is connected to a pressure gauge.

10. The hydraulic control valve of the overall telescopic mechanism of the roadheader according to claim 9, characterized in that, When the overall telescopic mechanism needs to disassemble the equipment, check the pressure value of the pressure gauge connected to the observation port M of the main valve body. Actuate the cutting telescopic oil cylinder or supply liquid to the control port G of the main valve body to discharge the pressure through the second overflow valve. After observing that the pressure value of the pressure gauge at port M drops to the set pressure value of the second overflow valve, adjust the pressure value of the first overflow valve to the lowest. Actuate the cutting telescopic oil cylinder or supply liquid to the control port G of the main valve body. Observe that the pressure value of the pressure gauge at port M approaches zero, and then slowly remove the pipeline.

Images