阅读说明：本技术 一种半自动调整对辊制砂机辊轮间隙的控制系统 (Control system for semi-automatically adjusting gap between rollers of pair-roller sand making machine ) 是由 何腾 朱旭勇 于 2021-10-11 设计创作，主要内容包括：一种半自动调整对辊制砂机辊轮间隙的控制系统,包括带有辊轮间隙的固定辊轮和可调辊轮,所述的可调辊轮安装于移动安装座上,移动安装座连接主液压缸的顶杆,主液压缸的顶杆受控于液压系统,主液压缸的顶杆前后运动调节辊轮间隙,所述的辊轮间隙包括在对辊制砂机停机状态下的第一调整间隙以及在辊制砂机开机状态下的第二调整间隙；所述的第一调整间隙由主液压缸的顶杆控制,所述的第二调整间隙由副液压缸配合主液压缸的顶杆控制。本发明采用固定辊轮和可调辊轮结构,通过液压系统对辊轮间隙进行调整,实现辊轮间隙的快速调整以及不停机调整的技术性能。(A control system for semi-automatically adjusting the gap between rollers of a pair-roller sand making machine comprises a fixed roller and an adjustable roller, wherein the fixed roller and the adjustable roller are provided with roller gaps; the first adjusting gap is controlled by a mandril of the main hydraulic cylinder, and the second adjusting gap is controlled by the auxiliary hydraulic cylinder matched with the mandril of the main hydraulic cylinder. The invention adopts the structures of the fixed roller and the adjustable roller, and adjusts the gap of the rollers through the hydraulic system, thereby realizing the technical performance of quick adjustment and non-stop adjustment of the gap of the rollers.)

1. The utility model provides a control system in semi-automatic adjustment pair roller system sand machine running roller clearance, is including fixed running roller (7) and adjustable running roller (6) that have the running roller clearance, its characterized in that: the adjustable roller (6) is arranged on a movable mounting seat (8), the movable mounting seat (8) is connected with an ejector rod of a main hydraulic cylinder (5), the ejector rod of the main hydraulic cylinder (5) is controlled by a hydraulic system, the ejector rod of the main hydraulic cylinder (5) moves back and forth to adjust a roller gap (1), and the roller gap (1) comprises a first adjusting gap in a shutdown state of the pair roller sand making machine and a second adjusting gap in a startup state of the pair roller sand making machine; the first adjusting gap is controlled by a mandril of the main hydraulic cylinder (5), and the second adjusting gap is controlled by the mandril of the auxiliary hydraulic cylinder (2) matched with the main hydraulic cylinder (5).

2. The control system for semi-automatically adjusting the gap between the rollers of the roller pair sand making machine according to claim 1, is characterized in that: the hydraulic system comprises an oil tank, wherein the oil tank is respectively connected with an oil pump, an electromagnetic overflow valve, a main oil way control system for controlling the stroke of the ejector rod of the main hydraulic cylinder (5) and an auxiliary oil way control system for controlling the stroke of the ejector rod of the auxiliary hydraulic cylinder (2).

3. The control system for semi-automatically adjusting the gap between the rollers of the roller pair sand making machine according to claim 2, is characterized in that: the main oil path control system comprises an oil pump, an electromagnetic overflow valve, a second electromagnetic valve and a third electromagnetic valve which are connected by an oil path, wherein the second electromagnetic valve is provided with a switch 4CT and a switch 5CT, and the third electromagnetic valve is provided with a switch 6CT and a switch 7 CT; the switch 4CT controls a P port and an A port on the second electromagnetic valve, an oil way of the P port is connected with an oil pump as an oil inlet, and the A port is connected with a D port on the hydraulic control one-way valve; the switch 5CT controls a T port and a B port on the second electromagnetic valve, an oil way of the T port is connected with an oil tank, and the B port is connected with a B port on the main hydraulic cylinder (5) through a D port on the hydraulic control one-way valve.

4. The control system for semi-automatically adjusting the gap between the rollers of the roller pair sand making machine according to claim 3, is characterized in that: the switch 6CT controls a P port and an A port on the third electromagnetic valve, an oil way of the P port is connected with an oil pump and serves as an oil inlet, and the A port is sequentially connected with the A port on the second one-way valve, the A port on the second overflow valve and the A port on the main hydraulic cylinder (5); and the switch 7CT controls a T port and a B port on the third electromagnetic valve, and an oil way of the T port is connected with an oil tank and the T port on the second overflow valve.

5. The control system for semi-automatically adjusting the gap between the rollers of the roller pair sand making machine according to claim 2, is characterized in that: the auxiliary oil path control system comprises an oil pump, an electromagnetic overflow valve and a first electromagnetic valve which are connected with an oil path, wherein the first electromagnetic valve is provided with a switch 2CT and a switch 3 CT; the switch 2CT controls a P port and an A port on the first electromagnetic valve, an oil way of the P port is connected with an oil pump and serves as an oil inlet, and the A port is sequentially connected with the A port on the first overflow valve, the A port on the first one-way valve, the A port on the auxiliary hydraulic cylinder (2) and the B port on the main hydraulic cylinder (5); the switch 3CT controls a T port and a B port on the first electromagnetic valve, the T port is connected with an oil tank through a T port oil way on the first overflow valve, and the B port is connected with a B port on the auxiliary hydraulic cylinder (2) through the B port on the first overflow valve.

6. The control system for semi-automatically adjusting the gap between the rollers of the roller pair sand making machine according to claim 5, is characterized in that: the auxiliary oil path control system also comprises a first travel switch (3) and a second travel switch (4) which are matched with the upper ejector rod of the auxiliary hydraulic cylinder (2).

7. The control system for semi-automatically adjusting the gap between the rollers of the roller pair sand making machine according to claim 2, is characterized in that: the electromagnetic overflow valve is provided with an electromagnetic switch 1CT, the electromagnetic switch 1CT controls the electromagnetic overflow valve to be in a direct oil outlet mode or an oil pressure maintaining and oil supplying mode, the direct oil outlet mode is that oil output by the oil pump directly flows into an oil tank through the electromagnetic overflow valve, and the oil pressure maintaining and oil supplying mode is that the oil output by the oil pump enters a hydraulic system.

8. A control method for semi-automatically adjusting the gap between rollers of a roller pair sand making machine is characterized in that: the control method comprises the following four state switching regulation:

the pair of roller sand making machines are shut down to shorten the gap between the rollers: stopping the roller sand making machine, opening an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, then opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow to a P port of a second electromagnetic valve from oil outlet of the oil pump, opening a switch 5CT to flow out of a B port of the second electromagnetic valve, flowing to a hydraulic control one-way valve, flowing out of a D port of the hydraulic control one-way valve, flowing into a B port of a main hydraulic cylinder to enter a working pressure cavity, and when the oil pressure of the B port of the working pressure cavity is greater than the oil pressure of an A port of return oil and the external total resistance of a mandril, pushing the mandril to move rightwards by the oil in the working pressure cavity, namely driving a movable mounting seat to move rightwards, and shortening a roller gap; when the movable mounting seat moves rightwards, the oil pressure of the port A of the oil return pressure cavity of the main hydraulic cylinder rises, redundant hydraulic oil flows out from the port A and flows to the port A of the second overflow valve, when the oil pressure reaches the set opening pressure of the second overflow valve, the valve of the second overflow valve is jacked open, the redundant hydraulic oil flows out from the port T of the second overflow valve and flows into an oil tank, after the operation is finished, the switch 5CT of the second electromagnetic valve is closed, oil supply to the main hydraulic cylinder is stopped, the pressure of an oil circuit rises, and the valve of the electromagnetic overflow valve is jacked open, so that the redundant hydraulic oil flows into the oil tank through the electromagnetic overflow valve;

and (3) stopping the two-pair roller sand making machine to enlarge the gap between the rollers: stopping the roller sand making machine, opening an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow from the oil pump to a port P of a third electromagnetic valve, opening a switch 6CT, enabling the hydraulic oil to flow out from a port A of the third electromagnetic valve, jacking a valve of the second one-way valve when the oil pressure of the port A of the third electromagnetic valve is greater than the oil pressure of the port A of the second one-way valve, enabling the hydraulic oil to flow out from the port A of the second one-way valve, enabling the hydraulic oil to flow into a port A of a main hydraulic cylinder to enter an oil return pressure cavity, and enabling the oil pressure cavity to push an ejector rod to move to the left when the oil pressure of the port A of the oil return pressure cavity is greater than the oil pressure of the port B of a working one-way valve, namely driving a movable mounting seat to move to the left to enlarge a roller gap; when the movable mounting seat moves leftwards, the oil pressure of the working pressure cavity of the main hydraulic cylinder rises, redundant hydraulic oil flows out from the port B of the main hydraulic cylinder and flows to the port D of the hydraulic control one-way valve, meanwhile, the switch 4CT of the second electromagnetic valve is opened, hydraulic oil flows in from the port P of the second electromagnetic valve and flows out from the port A of the hydraulic control one-way valve, the oil pressure of the port A rises, after the opening pressure of the hydraulic control one-way valve is reached, the valve of the hydraulic control one-way valve is opened, the oil circuit of the port D of the hydraulic control one-way valve is conducted, the hydraulic oil of the main hydraulic cylinder loop flows into the port B of the second electromagnetic valve through the port B of the hydraulic control one-way valve, flows out from the port T of the second electromagnetic valve and flows into an oil tank, after the work is finished, the switch 6CT of the third electromagnetic valve and the switch 4CT of the second electromagnetic valve are closed, the oil supply to the main hydraulic cylinder is stopped, the pressure of the oil circuit rises, the valve of the electromagnetic overflow valve is opened, the redundant hydraulic oil flows into an oil tank through an electromagnetic overflow valve;

the three pairs of roller sand making machines are not stopped to reduce the gap between the rollers: turning on an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, then opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow to a P port of a first electromagnetic valve from oil outlet of the oil pump, opening a switch 3CT of the first electromagnetic valve to flow out of a B port of the first electromagnetic valve, flow into a B port of an auxiliary hydraulic cylinder to enter a working pressure chamber of the auxiliary hydraulic cylinder, when the oil pressure of the B port is greater than the oil pressure of an oil return pressure chamber of the auxiliary hydraulic cylinder, pushing a mandril of the auxiliary hydraulic cylinder to move right by the working pressure chamber oil, increasing the oil pressure of the oil return pressure chamber, when the oil pressure of an A port of the oil return pressure chamber of the auxiliary hydraulic cylinder is greater than the B port of a main hydraulic cylinder, enabling the hydraulic oil to flow out of the A port of the auxiliary hydraulic cylinder, pushing a hydraulic control one-way valve open and flow out of a D port of the hydraulic control one-way valve, when the oil pressure of the port B of the B flowing into the main hydraulic cylinder is larger than the oil pressure of the port A of the main hydraulic cylinder, the oil of the working pressure cavity of the main hydraulic cylinder pushes the ejector rod to move rightwards, namely, the driving movable mounting seat moves rightwards, the gap of the roller is reduced, when the ejector rod of the auxiliary hydraulic cylinder touches the second travel switch, the second travel switch controls to close the first electromagnetic valve switch 3CT, the oil supply to the auxiliary hydraulic cylinder is stopped, the pressure of an oil circuit is increased, the valve of the electromagnetic overflow valve is opened in a jacking mode, and redundant hydraulic oil flows into an oil tank through the electromagnetic overflow valve.

9. The four-pair roller sand making machine continuously reduces the gap between the rollers without stopping the machine: the method comprises the steps that an oil pump is started without stopping a roller sand making machine, hydraulic oil output by the oil pump directly flows through an electromagnetic overflow valve to enter an oil tank, then an electromagnetic switch 1CT is opened, the electromagnetic overflow valve is closed in a direct oil outlet mode, an oil pressure maintaining and oil supplying mode is started, the hydraulic oil directly flows to a P port of a first electromagnetic valve from the oil outlet of the oil pump, the electromagnetic switch 2CT is opened, the hydraulic oil flows out from an A port of the first electromagnetic valve, the hydraulic oil flows through the A port of the first overflow valve, when the oil pressure is smaller than a set pressure of the first overflow valve, the first overflow valve is closed, the hydraulic oil directly flows to a first one-way valve, when the oil pressure is larger than the set pressure of the first overflow valve, the first overflow valve is pushed open, and the hydraulic oil flows into the oil tank through the T port of the first overflow valve;

when hydraulic oil flows to the first check valve, the oil pressure of the port A of the first electromagnetic valve is greater than the oil pressure of the port A of the first check valve, the valve of the first check valve is jacked open, the hydraulic oil flows out from the port A of the first check valve, when the oil pressure of the port A of the first electromagnetic valve is greater than the oil pressure of the port A of the auxiliary hydraulic cylinder, and simultaneously the oil pressure of the port A of the first electromagnetic valve is less than the oil pressure of the port B of the main hydraulic cylinder, the hydraulic oil flows out from the port A of the first check valve, flows into the port A of the auxiliary hydraulic cylinder and enters a return oil pressure chamber, the oil in the return oil pressure chamber pushes the mandril of the auxiliary hydraulic cylinder to move left, the oil pressure of the port B of the auxiliary hydraulic cylinder rises, redundant hydraulic oil flows out from the port B of the auxiliary hydraulic cylinder through a pipeline, flows out through the port B and the port T of the first electromagnetic valve and flows into an oil tank, and when the mandril of the auxiliary hydraulic cylinder moves left, the mandril of the stroke stop block touches the first stroke switch, and closing the switch 2CT, stopping supplying oil to the auxiliary hydraulic cylinder, increasing the pressure of an oil way, jacking a valve of the electromagnetic overflow valve, enabling redundant hydraulic oil to flow into an oil tank through the electromagnetic overflow valve, and then continuously reducing the gap between the rollers in the third state and the fourth state in a circulating manner.

Technical Field

The invention relates to a control system for a roller gap, in particular to a control system for semi-automatically adjusting the roller gap of a roller pair sand making machine.

Background

The pair roller sand making machine is important equipment for crushing mine gravel, the mine gravel has a severe working environment, the weight of the sand making and crushing equipment is large, and the gap adjustment is difficult after the pair roller is abraded. The adjustment to roller pair sand making machine running roller clearance mainly adopts the mechanical adjustment of shutting down at present, and this kind of mechanical adjustment mode mainly relies on removing the running roller and realizes, but running roller weight is very big, does not have professional equipment and is difficult to the adjusting position, and the adjustment needs the professional moreover, spends a large amount of time and can accomplish the adjustment, and the plant maintenance expense is high, and is higher to operating personnel's requirement. How to reduce the maintenance cost of the equipment and reduce the technical requirements for adjusting the gap of the roller by operators is the object of research by the technicians in the field.

The invention discloses a sand making machine disclosed in Chinese patent No. 201710743665.5, which comprises a shell, a bracket positioned in the shell, a fixed roller device, a movable roller device and a pressure adjusting device, wherein the fixed roller device, the movable roller device and the pressure adjusting device are arranged on the bracket; the fixed roller device comprises a fixed roller which is rotatably arranged on the bracket, the movable roller device comprises a bearing seat, a movable roller and a driving device for driving the movable roller to rotate, and the surfaces of the fixed roller and the movable roller are provided with wave-shaped tooth surfaces which are mutually matched; the movable roller and the driving device are arranged on the bearing block; and pulley slide rails are respectively arranged between the bearing seat and the support for sliding connection. Although the sand making machine adopts a hydraulic pressure mode pressure adjusting device and a movable roller adjusting device, the adopted technical means is only limited to a hydraulic cylinder, the common hydraulic cylinder of the large-scale equipment can not achieve pressure adjustment at all, and the adjustment can be realized only by a special hydraulic system.

Disclosure of Invention

The invention provides a control system for semi-automatically adjusting the gap between rollers of a roller pair sand making machine, which has long service life and an adjustment function without stopping the machine.

A control system for semi-automatically adjusting the gap between rollers of a pair-roller sand making machine comprises a fixed roller and an adjustable roller, wherein the fixed roller and the adjustable roller are provided with roller gaps; the first adjusting gap is controlled by a mandril of the main hydraulic cylinder, and the second adjusting gap is controlled by the auxiliary hydraulic cylinder matched with the mandril of the main hydraulic cylinder. The control system adopts the first adjustment gap in the shutdown state of the pair roller sand making machine and the second adjustment gap in the startup state of the pair roller sand making machine, so that the roller gap can be quickly adjusted to realize the first adjustment gap in the shutdown state, and the roller gap can be finely adjusted to realize the second adjustment gap while crushing stones in the startup state of the pair roller sand making machine.

The hydraulic system comprises an oil tank, wherein the oil tank is respectively connected with an oil pump, an electromagnetic overflow valve, a main oil way control system for controlling the stroke of the ejector rod of the main hydraulic cylinder and an auxiliary oil way control system for controlling the stroke of the ejector rod of the auxiliary hydraulic cylinder. The main oil circuit control system and the auxiliary oil circuit control system ensure that the main hydraulic cylinder obtains due thrust control for pushing the adjustable roller.

The main oil path control system comprises an oil pump, an electromagnetic overflow valve, a second electromagnetic valve and a third electromagnetic valve which are connected by an oil path, wherein the second electromagnetic valve is provided with a switch 4CT and a switch 5CT, and the third electromagnetic valve is provided with a switch 6CT and a switch 7 CT; the switch 4CT controls a P port and an A port on the second electromagnetic valve, an oil way of the P port is connected with an oil pump as an oil inlet, and the A port is connected with a D port on the hydraulic control one-way valve; the switch 5CT controls a T port and a B port on the second electromagnetic valve, an oil way of the T port is connected with an oil tank, and the B port is connected with a B port on the main hydraulic cylinder through a D port on the hydraulic control one-way valve.

The switch 6CT controls a P port and an A port on the third electromagnetic valve, an oil way of the P port is connected with an oil pump and is an oil inlet, and the A port is sequentially connected with the A port on the second one-way valve, the A port on the second overflow valve and the A port on the main hydraulic cylinder; and the switch 7CT controls a T port and a B port on the third electromagnetic valve, and an oil way of the T port is connected with an oil tank and the T port on the second overflow valve. According to the main oil circuit control system, on the basis of ensuring the pressure of an oil circuit, the power output control performance of the main hydraulic cylinder ejector rod under the high pressure of the oil pump is jointly realized by adopting the second electromagnetic valve and the third electromagnetic valve to be matched with the hydraulic control one-way valve, the second overflow valve and the second one-way valve through the oil pump, the electromagnetic overflow valve, the second electromagnetic valve and the third electromagnetic valve.

The auxiliary oil path control system comprises an oil pump, an electromagnetic overflow valve and a first electromagnetic valve which are connected with an oil path, wherein the first electromagnetic valve is provided with a switch 2CT and a switch 3 CT; the switch 2CT controls a P port and an A port on the first electromagnetic valve, an oil way of the P port is connected with an oil pump and serves as an oil inlet, and the A port is sequentially connected with the A port on the first overflow valve, the A port on the first one-way valve, the A port on the auxiliary hydraulic cylinder and the B port on the main hydraulic cylinder; the switch 3CT controls a T port and a B port on the first electromagnetic valve, the T port is connected with an oil tank through a T port oil way on the first overflow valve, and the B port is connected with a B port on the auxiliary hydraulic cylinder through a B port on the first overflow valve. The auxiliary oil circuit control system realizes the output control performance of micro-power adjustment of the main hydraulic cylinder ejector rod under the high pressure of the oil pump under the non-stop state on the basis of the main oil circuit control system through the oil pump, the electromagnetic overflow valve and the first electromagnetic valve.

The auxiliary oil path control system also comprises a first travel switch and a second travel switch which are matched with the upper ejector rod of the auxiliary hydraulic cylinder. The first travel switch and the second travel switch are matched to adjust the distance of the upper ejector rod of the auxiliary hydraulic cylinder to the stroke adjustment of the ejector rod of the main hydraulic cylinder.

The electromagnetic overflow valve is provided with an electromagnetic switch 1CT, the electromagnetic switch 1CT controls the electromagnetic overflow valve to be in a direct oil outlet mode or an oil pressure maintaining and oil supplying mode, the direct oil outlet mode is that oil output by the oil pump directly flows into an oil tank through the electromagnetic overflow valve, and the oil pressure maintaining and oil supplying mode is that the oil output by the oil pump enters a hydraulic system. The electromagnetic overflow valve structure ensures the power maintenance and power output of the control system to the adjustable roller.

A control method for semi-automatically adjusting the gap between rollers of a roller pair sand making machine comprises the following four states of switching and adjusting:

the pair of roller sand making machines are shut down to shorten the gap between the rollers: stopping the roller sand making machine, opening an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, then opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow to a P port of a second electromagnetic valve from oil outlet of the oil pump, opening a switch 5CT to flow out of a B port of the second electromagnetic valve, flowing to a hydraulic control one-way valve, flowing out of a D port of the hydraulic control one-way valve, flowing into a B port of a main hydraulic cylinder to enter a working pressure cavity, and when the oil pressure of the B port of the working pressure cavity is greater than the oil pressure of an A port of return oil and the external total resistance of a mandril, pushing the mandril to move rightwards by the oil in the working pressure cavity, namely driving a movable mounting seat to move rightwards, and shortening a roller gap; when the movable mounting seat moves rightwards, the oil pressure of the port A of the oil return pressure cavity of the main hydraulic cylinder rises, redundant hydraulic oil flows out from the port A and flows to the port A of the second overflow valve, when the oil pressure reaches the set opening pressure of the second overflow valve, the valve of the second overflow valve is jacked open, the redundant hydraulic oil flows out from the port T of the second overflow valve and flows into an oil tank, after the operation is finished, the switch 5CT of the second electromagnetic valve is closed, oil supply to the main hydraulic cylinder is stopped, the pressure of an oil circuit rises, and the valve of the electromagnetic overflow valve is jacked open, so that the redundant hydraulic oil flows into the oil tank through the electromagnetic overflow valve;

and (3) stopping the two-pair roller sand making machine to enlarge the gap between the rollers: stopping the roller sand making machine, opening an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow from the oil pump to a port P of a third electromagnetic valve, opening a switch 6CT, enabling the hydraulic oil to flow out from a port A of the third electromagnetic valve, jacking a valve of the second one-way valve when the oil pressure of the port A of the third electromagnetic valve is greater than the oil pressure of the port A of the second one-way valve, enabling the hydraulic oil to flow out from the port A of the second one-way valve, enabling the hydraulic oil to flow into a port A of a main hydraulic cylinder to enter an oil return pressure cavity, and enabling the oil pressure cavity to push an ejector rod to move to the left when the oil pressure of the port A of the oil return pressure cavity is greater than the oil pressure of the port B of a working one-way valve, namely driving a movable mounting seat to move to the left to enlarge a roller gap; when the movable mounting seat moves leftwards, the oil pressure of the working pressure cavity of the main hydraulic cylinder rises, redundant hydraulic oil flows out from the port B of the main hydraulic cylinder and flows to the port D of the hydraulic control one-way valve, meanwhile, the switch 4CT of the second electromagnetic valve is opened, hydraulic oil flows in from the port P of the second electromagnetic valve and flows out from the port A of the hydraulic control one-way valve, the oil pressure of the port A rises, after the opening pressure of the hydraulic control one-way valve is reached, the valve of the hydraulic control one-way valve is opened, the oil circuit of the port D of the hydraulic control one-way valve is conducted, the hydraulic oil of the main hydraulic cylinder loop flows into the port B of the second electromagnetic valve through the port B of the hydraulic control one-way valve, flows out from the port T of the second electromagnetic valve and flows into an oil tank, after the work is finished, the switch 6CT of the third electromagnetic valve and the switch 4CT of the second electromagnetic valve are closed, the oil supply to the main hydraulic cylinder is stopped, the pressure of the oil circuit rises, the valve of the electromagnetic overflow valve is opened, the redundant hydraulic oil flows into an oil tank through an electromagnetic overflow valve;

the three pairs of roller sand making machines are not stopped to reduce the gap between the rollers: turning on an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, then opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow to a P port of a first electromagnetic valve from oil outlet of the oil pump, opening a switch 3CT of the first electromagnetic valve to flow out of a B port of the first electromagnetic valve, flow into a B port of an auxiliary hydraulic cylinder to enter a working pressure chamber of the auxiliary hydraulic cylinder, when the oil pressure of the B port is greater than the oil pressure of an oil return pressure chamber of the auxiliary hydraulic cylinder, pushing a mandril of the auxiliary hydraulic cylinder to move right by the working pressure chamber oil, increasing the oil pressure of the oil return pressure chamber, when the oil pressure of an A port of the oil return pressure chamber of the auxiliary hydraulic cylinder is greater than the B port of a main hydraulic cylinder, enabling the hydraulic oil to flow out of the A port of the auxiliary hydraulic cylinder, pushing a hydraulic control one-way valve open and flow out of a D port of the hydraulic control one-way valve, when the oil pressure of the port B of the B flowing into the main hydraulic cylinder is larger than the oil pressure of the port A of the main hydraulic cylinder, the oil of the working pressure cavity of the main hydraulic cylinder pushes the ejector rod to move rightwards, namely, the driving movable mounting seat moves rightwards, the gap of the roller is reduced, when the ejector rod of the auxiliary hydraulic cylinder touches the second travel switch, the second travel switch controls to close the first electromagnetic valve switch 3CT, the oil supply to the auxiliary hydraulic cylinder is stopped, the pressure of an oil circuit is increased, the valve of the electromagnetic overflow valve is opened in a jacking mode, and redundant hydraulic oil flows into an oil tank through the electromagnetic overflow valve.

The four-pair roller sand making machine continuously reduces the gap between the rollers without stopping the machine: the method comprises the steps that an oil pump is started without stopping a roller sand making machine, hydraulic oil output by the oil pump directly flows through an electromagnetic overflow valve to enter an oil tank, then an electromagnetic switch 1CT is opened, the electromagnetic overflow valve is closed in a direct oil outlet mode, an oil pressure maintaining and oil supplying mode is started, the hydraulic oil directly flows to a P port of a first electromagnetic valve from the oil outlet of the oil pump, the electromagnetic switch 2CT is opened, the hydraulic oil flows out from an A port of the first electromagnetic valve, the hydraulic oil flows through the A port of the first overflow valve, when the oil pressure is smaller than a set pressure of the first overflow valve, the first overflow valve is closed, the hydraulic oil directly flows to a first one-way valve, when the oil pressure is larger than the set pressure of the first overflow valve, the first overflow valve is pushed open, and the hydraulic oil flows into the oil tank through the T port of the first overflow valve;

when hydraulic oil flows to the first check valve, the oil pressure of the port A of the first electromagnetic valve is greater than the oil pressure of the port A of the first check valve, the valve of the first check valve is jacked open, the hydraulic oil flows out from the port A of the first check valve, when the oil pressure of the port A of the first electromagnetic valve is greater than the oil pressure of the port A of the auxiliary hydraulic cylinder, and simultaneously the oil pressure of the port A of the first electromagnetic valve is less than the oil pressure of the port B of the main hydraulic cylinder, the hydraulic oil flows out from the port A of the first check valve, flows into the port A of the auxiliary hydraulic cylinder and enters a return oil pressure chamber, the oil in the return oil pressure chamber pushes the mandril of the auxiliary hydraulic cylinder to move left, the oil pressure of the port B of the auxiliary hydraulic cylinder rises, redundant hydraulic oil flows out from the port B of the auxiliary hydraulic cylinder through a pipeline, flows out through the port B and the port T of the first electromagnetic valve and flows into an oil tank, and when the mandril of the auxiliary hydraulic cylinder moves left, the mandril of the stroke stop block touches the first stroke switch, and closing the switch 2CT, stopping supplying oil to the auxiliary hydraulic cylinder, increasing the pressure of an oil way, jacking a valve of the electromagnetic overflow valve, enabling redundant hydraulic oil to flow into an oil tank through the electromagnetic overflow valve, and then continuously reducing the gap between the rollers in the third state and the fourth state in a circulating manner.

The invention adopts four states of stopping the double-roller sand making machine to shorten the gap between the rollers, stopping the double-roller sand making machine to enlarge the gap between the rollers, stopping the double-roller sand making machine to reduce the gap between the rollers and continuously reducing the gap between the rollers, thereby realizing the rapid and accurate adjustment performance of the gap between the rollers, ensuring the stability of the quality of sand and gravel made by the double-roller sand making machine, reducing the technical requirements on operators and reducing the maintenance cost.

Drawings

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a control system oil circuit structure for semi-automatically adjusting the gap between rollers of a roller pair sand making machine.

Detailed description of the preferred embodiments

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Please refer to fig. 1, which is a control system for semi-automatically adjusting the gap between rollers of a roller pair sand making machine, comprising a fixed roller 7 and an adjustable roller 6 with a gap between rollers, wherein the adjustable roller 6 is installed on a movable installation base 8, the movable installation base 8 is connected with a top rod of a main hydraulic cylinder 5, the top rod of the main hydraulic cylinder 5 is controlled by a hydraulic system, and the top rod of the main hydraulic cylinder 5 moves back and forth to adjust the gap 1 between rollers.

The adjustment of the roller gap 1 is divided into two states, namely a first adjustment gap in a shutdown state of the roller sand making machine, and a second adjustment gap in a startup state of the roller sand making machine; the first adjusting clearance is a clearance for quick adjustment, and the second adjusting clearance is fine adjustment based on the first adjusting clearance and is adjustment without stopping. The first adjustment gap is controlled by the jack of the master cylinder 5, and the second adjustment gap is controlled by the mating of the secondary cylinder 2 with the jack of the master cylinder 5.

The hydraulic system with the optimized structure comprises an oil tank, wherein the oil tank is respectively connected with an oil pump, an electromagnetic overflow valve, a main oil circuit control system for controlling the stroke of the mandril of the main hydraulic cylinder 5 and an auxiliary oil circuit control system for controlling the stroke of the mandril of the auxiliary hydraulic cylinder 2.

The main oil path control system comprises an oil pump, an electromagnetic overflow valve, a second electromagnetic valve and a third electromagnetic valve which are connected by an oil path, wherein the second electromagnetic valve is provided with a switch 4CT and a switch 5CT, and the third electromagnetic valve is provided with a switch 6CT and a switch 7 CT; the switch 4CT controls a P port and an A port on the second electromagnetic valve, a P port oil circuit is connected with the oil pump to serve as an oil inlet, the A port is connected with a D port on the hydraulic control one-way valve, the switch 5CT controls a T port and a B port on the second electromagnetic valve, the T port oil circuit is connected with the oil tank, and the B port is connected with a B port on the main hydraulic cylinder 5 through the D port on the hydraulic control one-way valve.

The switch 6CT controls a P port and an A port on the third electromagnetic valve, a P port oil circuit is connected with the oil pump and serves as an oil inlet, the A port is sequentially connected with the A port on the second one-way valve, the A port on the second overflow valve and the A port on the main hydraulic cylinder 5, the switch 7CT controls a T port and a B port on the third electromagnetic valve, and a T port oil circuit is connected with the oil tank and the T port on the second overflow valve.

The auxiliary oil circuit control system with the optimized structure comprises an oil pump, an electromagnetic overflow valve and a first electromagnetic valve, wherein the oil pump is connected with oil circuits, a switch 2CT and a switch 3CT are arranged on the first electromagnetic valve, the switch 2CT controls a port P and a port A on the first electromagnetic valve, the port P oil circuit is connected with the oil pump and serves as an oil inlet, the port A is sequentially connected with the port A on the first overflow valve, the port A on the first one-way valve, the port A on the auxiliary hydraulic cylinder 2 and the port B on the main hydraulic cylinder 5, the switch 3CT controls the port T and the port B on the first electromagnetic valve, the port T is connected with the oil tank through the oil circuit of the port T on the first overflow valve, and the port B is connected with the port B on the auxiliary hydraulic cylinder 2 through the port B on the first overflow valve.

In order to realize the stroke adjustment of the ejector rod of the auxiliary hydraulic cylinder 2, the auxiliary oil path control system also comprises a first stroke switch 3 and a second stroke switch 4 which are matched with the ejector rod on the auxiliary hydraulic cylinder 2.

In order to achieve the pressure maintaining capacity of the whole hydraulic system, the electromagnetic overflow valve is provided with an electromagnetic switch 1CT, the electromagnetic switch 1CT controls the electromagnetic overflow valve to be in a direct oil outlet mode or an oil pressure maintaining and oil supplying mode, the direct oil outlet mode is that oil output by the oil pump directly flows into an oil tank through the electromagnetic overflow valve, and the oil pressure maintaining and oil supplying mode is that the oil output by the oil pump enters the hydraulic system.

A control method for semi-automatically adjusting the gap between rollers of a roller pair sand making machine comprises the following four states of switching and adjusting:

the pair of roller sand making machines are shut down to shorten the gap between the rollers: stopping the roller sand making machine, opening an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, then opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow to a P port of a second electromagnetic valve from oil outlet of the oil pump, opening a switch 5CT to flow out of a B port of the second electromagnetic valve, flowing to a hydraulic control one-way valve, flowing out of a D port of the hydraulic control one-way valve, flowing into a B port of a main hydraulic cylinder to enter a working pressure cavity, and when the oil pressure of the B port of the working pressure cavity is greater than the oil pressure of an A port of return oil and the external total resistance of a mandril, pushing the mandril to move rightwards by the oil in the working pressure cavity, namely driving a movable mounting seat to move rightwards, and shortening a roller gap; when the movable mounting seat moves rightwards, the oil pressure of the port A of the oil return pressure cavity of the main hydraulic cylinder rises, redundant hydraulic oil flows out from the port A and flows to the port A of the second overflow valve, when the oil pressure reaches the set opening pressure of the second overflow valve, the valve of the second overflow valve is jacked open, the redundant hydraulic oil flows out from the port T of the second overflow valve and flows into an oil tank, after the operation is finished, the switch 5CT of the second electromagnetic valve is closed, oil supply to the main hydraulic cylinder is stopped, the pressure of an oil circuit rises, and the valve of the electromagnetic overflow valve is jacked open, so that the redundant hydraulic oil flows into the oil tank through the electromagnetic overflow valve;

and (3) stopping the two-pair roller sand making machine to enlarge the gap between the rollers: stopping the roller sand making machine, opening an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow from the oil pump to a port P of a third electromagnetic valve, opening a switch 6CT, enabling the hydraulic oil to flow out from a port A of the third electromagnetic valve, jacking a valve of the second one-way valve when the oil pressure of the port A of the third electromagnetic valve is greater than the oil pressure of the port A of the second one-way valve, enabling the hydraulic oil to flow out from the port A of the second one-way valve, enabling the hydraulic oil to flow into a port A of a main hydraulic cylinder to enter an oil return pressure cavity, and enabling the oil pressure cavity to push an ejector rod to move to the left when the oil pressure of the port A of the oil return pressure cavity is greater than the oil pressure of the port B of a working one-way valve, namely driving a movable mounting seat to move to the left to enlarge a roller gap; when the movable mounting seat moves leftwards, the oil pressure of the working pressure cavity of the main hydraulic cylinder rises, redundant hydraulic oil flows out from the port B of the main hydraulic cylinder and flows to the port D of the hydraulic control one-way valve, meanwhile, the switch 4CT of the second electromagnetic valve is opened, hydraulic oil flows in from the port P of the second electromagnetic valve and flows out from the port A of the hydraulic control one-way valve, the oil pressure of the port A rises, after the opening pressure of the hydraulic control one-way valve is reached, the valve of the hydraulic control one-way valve is opened, the oil circuit of the port D of the hydraulic control one-way valve is conducted, the hydraulic oil of the main hydraulic cylinder loop flows into the port B of the second electromagnetic valve through the port B of the hydraulic control one-way valve, flows out from the port T of the second electromagnetic valve and flows into an oil tank, after the work is finished, the switch 6CT of the third electromagnetic valve and the switch 4CT of the second electromagnetic valve are closed, the oil supply to the main hydraulic cylinder is stopped, the pressure of the oil circuit rises, the valve of the electromagnetic overflow valve is opened, the redundant hydraulic oil flows into an oil tank through an electromagnetic overflow valve;

the three pairs of roller sand making machines are not stopped to reduce the gap between the rollers: turning on an oil pump, enabling hydraulic oil output by the oil pump to directly flow through an electromagnetic overflow valve to enter an oil tank, then opening an electromagnetic switch 1CT to enable the electromagnetic overflow valve to close a direct oil outlet mode, starting an oil pressure maintaining and oil supplying mode to enable the hydraulic oil to directly flow to a P port of a first electromagnetic valve from oil outlet of the oil pump, opening a switch 3CT of the first electromagnetic valve to flow out of a B port of the first electromagnetic valve, flow into a B port of an auxiliary hydraulic cylinder to enter a working pressure chamber of the auxiliary hydraulic cylinder, when the oil pressure of the B port is greater than the oil pressure of an oil return pressure chamber of the auxiliary hydraulic cylinder, pushing a mandril of the auxiliary hydraulic cylinder to move right by the working pressure chamber oil, increasing the oil pressure of the oil return pressure chamber, when the oil pressure of an A port of the oil return pressure chamber of the auxiliary hydraulic cylinder is greater than the B port of a main hydraulic cylinder, enabling the hydraulic oil to flow out of the A port of the auxiliary hydraulic cylinder, pushing a hydraulic control one-way valve open and flow out of a D port of the hydraulic control one-way valve, when the oil pressure of the port B of the B flowing into the main hydraulic cylinder is larger than the oil pressure of the port A of the main hydraulic cylinder, the oil of the working pressure cavity of the main hydraulic cylinder pushes the ejector rod to move rightwards, namely, the driving movable mounting seat moves rightwards, the gap of the roller is reduced, when the ejector rod of the auxiliary hydraulic cylinder touches the second travel switch, the second travel switch controls to close the first electromagnetic valve switch 3CT, the oil supply to the auxiliary hydraulic cylinder is stopped, the pressure of an oil circuit is increased, the valve of the electromagnetic overflow valve is opened in a jacking mode, and redundant hydraulic oil flows into an oil tank through the electromagnetic overflow valve.

The four-pair roller sand making machine continuously reduces the gap between the rollers without stopping the machine: the method comprises the steps that an oil pump is started without stopping a roller sand making machine, hydraulic oil output by the oil pump directly flows through an electromagnetic overflow valve to enter an oil tank, then an electromagnetic switch 1CT is opened, the electromagnetic overflow valve is closed in a direct oil outlet mode, an oil pressure maintaining and oil supplying mode is started, the hydraulic oil directly flows to a P port of a first electromagnetic valve from the oil outlet of the oil pump, the electromagnetic switch 2CT is opened, the hydraulic oil flows out from an A port of the first electromagnetic valve, the hydraulic oil flows through the A port of the first overflow valve, when the oil pressure is smaller than a set pressure of the first overflow valve, the first overflow valve is closed, the hydraulic oil directly flows to a first one-way valve, when the oil pressure is larger than the set pressure of the first overflow valve, the first overflow valve is pushed open, and the hydraulic oil flows into the oil tank through the T port of the first overflow valve;

when hydraulic oil flows to the first check valve, the oil pressure of the port A of the first electromagnetic valve is greater than the oil pressure of the port A of the first check valve, the valve of the first check valve is jacked open, the hydraulic oil flows out from the port A of the first check valve, when the oil pressure of the port A of the first electromagnetic valve is greater than the oil pressure of the port A of the auxiliary hydraulic cylinder, and simultaneously the oil pressure of the port A of the first electromagnetic valve is less than the oil pressure of the port B of the main hydraulic cylinder, the hydraulic oil flows out from the port A of the first check valve, flows into the port A of the auxiliary hydraulic cylinder and enters a return oil pressure chamber, the oil in the return oil pressure chamber pushes the mandril of the auxiliary hydraulic cylinder to move left, the oil pressure of the port B of the auxiliary hydraulic cylinder rises, redundant hydraulic oil flows out from the port B of the auxiliary hydraulic cylinder through a pipeline, flows out through the port B and the port T of the first electromagnetic valve and flows into an oil tank, and when the mandril of the auxiliary hydraulic cylinder moves left, the mandril of the stroke stop block touches the first stroke switch, and closing the switch 2CT, stopping supplying oil to the auxiliary hydraulic cylinder, increasing the pressure of an oil way, jacking a valve of the electromagnetic overflow valve, enabling redundant hydraulic oil to flow into an oil tank through the electromagnetic overflow valve, and then continuously reducing the gap between the rollers in the third state and the fourth state in a circulating manner.

The method for adjusting the gap between the rollers of the roller pair sand making machine ensures the hydraulic power output by the oil pump, maintains pressure and finely adjusts the gap between the rollers on the basis of adjusting the gap between the rollers, can stop the machine to adjust the gap between the rollers, and can also finely adjust the gap between the rollers by overcoming the crushing pressure of stone materials in a starting state to ensure the sand making quality, namely ensure the uniformity of sand particles.

As a preferable adjustment method, the second stroke switch can adjust the stroke length of the secondary hydraulic cylinder push rod corresponding to the adjustment stroke of the main hydraulic cylinder push rod. When the secondary hydraulic cylinder ejector rod automatically feeds, the ejector rod contacts the second travel switch and then the secondary hydraulic cylinder ejector rod automatically returns, and when the secondary hydraulic cylinder ejector rod contacts the first travel switch, oil supply to the secondary hydraulic cylinder is stopped. The PLC control board controls the auxiliary hydraulic cylinder to automatically feed in a timing mode to adjust the gap of the roller wheel so as to further improve the uniformity of the crushed sand grains.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.