CN216812326U

CN216812326U - Full-hydraulic system for coal mine for pumping type wet spraying machine

Info

Publication number: CN216812326U
Application number: CN202123295344.4U
Authority: CN
Inventors: 詹东阳; 颜威合; 张效瑞; 李博; 黄范; 彭建永; 彭玥; 宋文; 汪玉龙
Original assignee: Henan Coal Science Research Institute Keming Electromechanical Equipment Co ltd
Current assignee: Henan Coal Science Research Institute Keming Electromechanical Equipment Co ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-06-24
Anticipated expiration: 2031-12-27

Abstract

The utility model belongs to the technical field of concrete wet spraying machines for mines. A full hydraulic system for a coal mine for a pumping type wet spraying machine comprises a duplex oil pump, a main cylinder, a tilt cylinder and a logic valve, wherein the duplex oil pump comprises a first oil pump and a second oil pump; the first oil pump is connected with the main cylinder through a first one-way valve, a main cylinder manual reversing valve and a main cylinder hydraulic reversing valve; the second oil pump is connected with the tilt cylinder through a second one-way valve, an energy accumulator, a tilt cylinder manual reversing valve and a tilt cylinder hydraulic reversing valve; the control oil port of the main cylinder and the control oil port of the tilt cylinder are connected with the inlet of the logic valve, the outlet of the logic valve is connected with the valve core reversing hydraulic cylinder of the main cylinder hydraulic reversing valve and the tilt cylinder hydraulic reversing valve, and synchronous reversing of the main cylinder and the tilt cylinder oil circuit is realized through corresponding valve core actions. According to the method and the device, explosion-proof electromagnetic reversing can be realized, the reversing action of the tilt cylinder can be 0.3 second, the flow of a tilt cylinder hydraulic system loop is not influenced, the stability of the system is improved, and the heat productivity of the system is reduced.

Description

Full-hydraulic system for coal mine for pumping type wet spraying machine

Technical Field

The utility model belongs to the technical field of concrete wet blasting machines for mines, and particularly relates to a full-hydraulic system for a coal mine for a pumping type wet blasting machine.

Background

The concrete wet spraying machine is used as main equipment for spray anchor support in mine roadways, railway and highway tunnels, water conservancy culverts, various underground projects, high-rise building foundation pits, and the like, and has wide application. The pumping type wet spraying machine is used as main equipment of wet spraying, and has the advantages of adjustable sprayed concrete amount, high pumping pressure, long conveying distance, large conveying displacement, high comprehensive work efficiency and high sprayed concrete performance. The wet spraying process has the remarkable advantages of small operation dust, less spraying resilience, work environment protection, raw material saving, spraying layer quality improvement and the like, reduces the dust concentration beside the machine and outside the spray nozzle, eliminates the harm to the health of workers, and effectively saves the cost. At present, the wet spraying process is adopted in engineering construction. At present, due to the original construction process and underground complex environment of a coal mine, the coal mine roadway support mostly adopts a wet spraying process with a dust removal device, along with the adjustment of national policies, the enhancement of environmental protection consciousness of people and the improvement of the quality requirement of sprayed concrete, and the coal mine roadway support in the future is developed by adopting a wet spraying technology.

At present, a pumping type wet spraying machine for engineering is mature, a hydraulic system adopts an electromagnetic reversing technology and a double-pump double-loop system, reversing speed is high, guniting pulse is small, and performance is stable. However, the explosion-proof performance of the hydraulic system of the pumping type wet spraying machine for the coal mine needs to be considered, two schemes are provided in the current market, one scheme is that an explosion-proof double-pump double-loop hydraulic system is adopted, the working principle is shown in fig. 2, the strict explosion-proof requirement under the coal mine is considered, the explosion-proof requirement and the extremely high safety factor are not only met, but also the long-term stability of the equipment needs to be comprehensively considered, the pumping type wet spraying machine belongs to equipment with high impact force, the distribution box of the pumping hydraulic system can be seriously impacted by long-term work, the inserted connecting piece in the distribution box is loosened or even falls off, and the like, and potential safety hazards exist; the other is a full-hydraulic single-pump system, the working principle is shown in figure 1, the system has no electric elements, the reliability is high, but the defect exists, because the single-pump hydraulic system can simultaneously reduce the reversing action speed of the swing cylinder when reducing the slurry spraying amount, the reversing action speed is far higher than 0.3 second, even exceeds 0.4 second, the impact on slurry spraying is great, slurry spraying pulse is large, a hopper is blown against the wind, no material is discharged, and the equipment cannot normally work until the screen is blown over by blowing against the wind and the material.

Disclosure of Invention

The utility model aims to solve the problems and the defects, and provides a full hydraulic system for a coal mine for a pumping wet sprayer, which can realize explosion-proof electromagnetic reversing, can ensure that the reversing action of a tilt cylinder is within 0.3 second, does not influence the flow of a return circuit of the tilt cylinder hydraulic system, improves the stability of the system and reduces the heat productivity of the system.

In order to realize the purpose, the adopted technical scheme is as follows:

a full hydraulic pressure system for coal mine for pumping type wet blasting machine comprises:

the double oil pump comprises a first oil pump and a second oil pump;

the first oil pump is connected with the main cylinder through a first one-way valve, a main cylinder manual reversing valve and a main cylinder hydraulic reversing valve;

the second oil pump is connected with the tilt cylinder through a second one-way valve, an energy accumulator, a tilt cylinder manual reversing valve and a tilt cylinder hydraulic reversing valve; and

and the control oil port of the main cylinder and the control oil port of the tilt cylinder are connected with the inlet of the logic valve, the outlet of the logic valve is connected with the valve core reversing hydraulic cylinder of the main cylinder hydraulic reversing valve and the tilt cylinder hydraulic reversing valve, and synchronous reversing of the main cylinder and the tilt cylinder oil path is realized through corresponding valve core action.

According to the full hydraulic system for the coal mine for the pumping wet sprayer, preferably, the oil pumps are communicated, the outlet of the first one-way valve is connected with the overflow valve, the inlet of the second one-way valve is communicated with the second oil pump, and the outlet of the second one-way valve is connected with the unloading overflow valve.

According to the full hydraulic system for the coal mine for the pumping type wet blasting machine, preferably, the logic valve is a duplex cartridge valve;

reversing a hydraulic reversing valve of the swing cylinder: after the signal oil of the main cylinder enters the logic valve, the pressure oil at the outlet of the corresponding logic valve enters the tilt cylinder hydraulic reversing valve and pushes the valve core of the tilt cylinder hydraulic reversing valve to move, so that the reversing of the tilt cylinder hydraulic reversing valve is realized;

reversing a hydraulic reversing valve of a main cylinder: after the signal oil of the swing cylinder enters the logic valve, the pressure oil at the outlet of the corresponding logic valve enters the hydraulic reversing valve of the main cylinder and pushes the valve core of the hydraulic reversing valve of the main cylinder to move, so that the reversing of the hydraulic reversing valve of the main cylinder is realized.

According to the full-hydraulic system for the coal mine for the pumping type wet spraying machine, preferably, the first oil pump is a manual variable plunger pump, the second oil pump is a constant pressure pump, and the nitrogen charging pressure of the energy accumulator is 7 MPa-9 MPa.

By adopting the technical scheme, the beneficial effects are as follows:

the system adopts a double-pump double-loop hydraulic system, the flow of a loop of the tilt cylinder hydraulic system is not influenced while the guniting amount is adjusted, and the tilt cylinder hydraulic system is provided with an energy accumulator, so that the action time of the tilt cylinder reversing can be ensured to be 0.3 second.

And secondly, an unloading overflow valve is adopted in the hydraulic circuit of the oscillating cylinder, so that the system pressure is ensured, the heating of the system can be reduced, and the stability of the whole hydraulic system is ensured.

The variable plunger pump is used for replacing a speed regulating valve to regulate the flow of the main cylinder hydraulic system, so that the heat productivity of the system is reduced, and the heat productivity of the whole hydraulic system is reduced.

Experiments prove that the full hydraulic system for the coal mine for the pumping type wet sprayer can meet the requirement of wet type guniting, the guniting hose can be directly connected to the outlet of the wet sprayer for guniting, the guniting speed can be adjusted in a stepless mode, the cylinder swinging action speed can reach 0.3s all the time, and meanwhile the heat productivity of the system is obviously reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the utility model and are not to be construed as limiting the utility model to all embodiments thereof.

Fig. 1 is a hydraulic schematic diagram of a single pump system of a prior full hydraulic pumping type wet spraying machine.

Fig. 2 is an electromagnetic reversing double-pump double-loop hydraulic schematic diagram of the existing pumping wet sprayer.

Fig. 3 is a schematic diagram of a full hydraulic system for coal mines for a pumping wet sprayer according to an embodiment of the utility model.

Number in the figure:

1-overflow valve, 2-duplex oil pump, 3-unloading overflow valve, 4-energy accumulator, 5-tilt cylinder manual reversing valve, 6-master cylinder manual reversing valve, 7-one-way throttle valve, 8-master cylinder hydraulic reversing valve, 9-first one-way valve, 10-second one-way valve, 11-tilt cylinder hydraulic reversing valve, 13-first tilt cylinder, 14-second tilt cylinder, 15-first master cylinder, 16-second master cylinder and 17-logic valve.

Detailed Description

Illustrative aspects of embodiments of the utility model are described more fully hereinafter with reference to the accompanying drawings, in which specific embodiments of the utility model are shown. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art.

In the description of the present invention, it should be understood that the terms "first" and "second" are used to describe various elements of the utility model, and are not intended to limit any order, quantity, or importance, but rather are used to distinguish one element from another.

It should be noted that when an element is referred to as being "connected," "coupled," or "connected" to another element, it can be directly connected, coupled, or connected, but it is understood that intervening elements may be present therebetween; i.e., positional relationships encompassing both direct and indirect connections.

It should be noted that the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items.

It should be noted that terms indicating orientation or positional relationship such as "upper", "lower", "left", "right", and the like, are used only for indicating relative positional relationship, which is for convenience in describing the present invention, and do not indicate that the device or element must have a specific orientation, be constructed and operated in a specific orientation; when the absolute position of the object to be described is changed, the relative positional relationship may also be changed accordingly.

Referring to fig. 3, the application discloses a full hydraulic system for a coal mine for a pumping type wet sprayer, which comprises a duplex oil pump 2, a main cylinder, a tilt cylinder and a logic valve 17, wherein the duplex oil pump comprises a first oil pump and a second oil pump; the main cylinders and the swing cylinders in the pumping type wet spraying machine are two groups, namely a first main cylinder 15, a second main cylinder 16, a first swing cylinder 13 and a second swing cylinder 14 shown in the figure, and the first oil pump is connected with the main cylinders through a first one-way valve 9, a main cylinder manual reversing valve 6 and a main cylinder hydraulic reversing valve 8; the second oil pump is connected with the tilt cylinder through a second one-way valve 10, an energy accumulator 4, a tilt cylinder manual reversing valve 5 and a tilt cylinder hydraulic reversing valve 11; the control oil port of the main cylinder and the control oil port of the tilt cylinder are connected with the inlet of the logic valve 17, the outlet of the logic valve 17 is connected with the valve core reversing hydraulic cylinders of the main cylinder hydraulic reversing valve 8 and the tilt cylinder hydraulic reversing valve 11, and synchronous reversing of the oil paths of the main cylinder and the tilt cylinder is realized through corresponding valve core actions. The duplex oil pump 2 supplies pressure oil to the main cylinder and the tilt cylinder through the reversing valve and the accessories thereof, realizes synchronous reversing of the main cylinder and the tilt cylinder, and completes the concrete spraying work of the pumping type wet spraying machine by depending on a mechanical mechanism of the wet spraying machine.

The master cylinder hydraulic system and the tilt cylinder hydraulic system in the embodiment are double-pump double-loop full hydraulic systems.

The inlet of a first one-way valve 9 is communicated with the first oil pump, the outlet of the first one-way valve 9 is connected with an overflow valve 1, the inlet of a second one-way valve 10 is communicated with the second oil pump, and the outlet of the second one-way valve 10 is connected with an unloading overflow valve 3. The first one-way valve 9 and the second one-way valve 10 in the structure are arranged at oil outlets of corresponding oil pumps, the system and the pumps are separated by the one-way valves, when the oil pumps are started, hydraulic oil discharged by the pumps can enter the hydraulic system through the one-way valves, and when pressure loads of the system suddenly rise or power failure occurs due to the one-way valves, the system is still in a pressure maintaining state, so that the phenomenon that the hydraulic pumps are damaged due to backflow of oil of the hydraulic system can be prevented.

The first oil pump is a manual variable plunger pump, the mortar spraying capacity of the wet spraying machine is adjusted in a stepless mode by adjusting the discharge capacity of the manual variable plunger pump, and the second oil pump is a constant pressure pump and ensures that pressure oil is flushed into the energy accumulator at constant pressure. And the nitrogen charging pressure of the energy accumulator is 7-9 MPa. The energy accumulator in the hydraulic circuit of the tilt cylinder is important for controlling the time of the motion of the tilt cylinder, the energy accumulator is arranged at the inlet of a manual tilt cylinder reversing valve for controlling the tilt cylinder, the nitrogen charging pressure of the energy accumulator is preferably about 8MPa, the motion time of the tilt cylinder is required to be within 0.3s, and the energy accumulator is realized by instantly releasing hydraulic oil rushed in the energy accumulator to push the tilt cylinder.

The logic valve is a duplex cartridge valve; the logic valve 17 is respectively connected with the master cylinder hydraulic reversing valve and the tilt cylinder hydraulic reversing valve. The main cylinder control oil port and the swing cylinder control oil port respectively enter the logic valve, and then the outlet of the logic valve is connected with the valve core reversing hydraulic cylinder of the main cylinder hydraulic reversing valve and the swing cylinder hydraulic reversing valve to perform the action of the valve core, so as to reverse the oil path and realize the synchronous reversing of the main cylinder and the swing cylinder.

When the hydraulic reversing valve works, after high-pressure signal oil of the main cylinder enters the logic valve, the one-way valve inside the logic valve is opened, then the pressure oil enters the spring cavity on one side of the hydraulic reversing valve of the tilt cylinder for controlling the tilt cylinder, the valve core is pushed to move, the reversing of the hydraulic reversing valve of the tilt cylinder is realized, the piston rod of the tilt cylinder is further pushed out, and the S-shaped pipe valve of the wet spraying machine is reversed. Meanwhile, after the high-pressure signal oil of the swing cylinder enters the logic valve, the one-way valve inside the logic valve is opened, then the pressure oil enters a spring cavity on one side of a main cylinder hydraulic reversing valve for controlling the main cylinder, the valve core is pushed to move, the reversing of the main cylinder hydraulic reversing valve is realized, and the piston rod of the main cylinder is pushed to be pushed out.

The unloading overflow valve of the tilt cylinder hydraulic loop is arranged at the outlet of the one-way valve, and the main function of the unloading overflow valve is to automatically control the unloading of the pump and reduce the heating of a hydraulic system.

When the equipment works, the reverse pump operation of the positive pump of the wet spraying machine can be realized by adjusting the shifting direction of the handles of the manual reversing valves for controlling the main cylinder and the swing cylinder, the guniting operation is realized by the positive pump operation, and the reverse pump operation is used under the conditions of cleaning and pipe plugging.

Tests prove that the full hydraulic system for the coal mine for the pumping type wet spraying machine meets the requirement of wet type guniting, the outlet of the wet spraying machine can be directly connected with a guniting hose for guniting, the guniting speed can be adjusted in a stepless mode, the action speed of a swing cylinder can reach 0.3s all the time, and meanwhile the heat productivity of the system is obviously reduced.

While the preferred embodiments for carrying out the utility model have been described in detail, it should be understood that they have been presented by way of example only, and not limitation as to the scope, applicability, or configuration of the utility model in any way. The scope of the utility model is defined by the appended claims and equivalents thereof. Many modifications may be made to the foregoing embodiments by those skilled in the art, which modifications are within the scope of the present invention.

Claims

1. The utility model provides a full hydraulic pressure system for coal mine for pump sending formula wet blasting machine which characterized in that includes:

the double oil pump comprises a first oil pump and a second oil pump;

2. The full hydraulic system for the coal mine for the pumping wet blasting machine according to claim 1, wherein an inlet of the first check valve is communicated with the first oil pump, an outlet of the first check valve is connected with an overflow valve, an inlet of the second check valve is communicated with the second oil pump, and an outlet of the second check valve is connected with an unloading overflow valve.

3. The all-hydraulic coal mine hydraulic system for the pumped wet sprayer of claim 1, wherein the logic valve is a double cartridge valve;

4. The full hydraulic system for the coal mine for the pumping wet sprayer according to claim 1, wherein the first oil pump is a manual variable plunger pump, the second oil pump is a constant pressure pump, and the nitrogen charging pressure of the accumulator is 7 MPa-9 MPa.