A control system for semi-automatic adjustment of roller clearance of roller sand making machine

Abstract

A semi-automatic control system for adjusting the roller gap of a double-roll crusher includes a fixed roller with a roller gap and an adjustable roller. The adjustable roller is mounted on a movable mounting base, which is connected to the push rod of a main hydraulic cylinder. The push rod of the main hydraulic cylinder is controlled by a hydraulic system, and its back-and-forth movement adjusts the roller gap. The roller gap includes a first adjustment gap when the double-roll crusher is stopped and a second adjustment gap when the crusher is running. The first adjustment gap is controlled by the push rod of the main hydraulic cylinder, and the second adjustment gap is controlled by an auxiliary hydraulic cylinder in conjunction with the push rod of the main hydraulic cylinder. This invention employs a fixed roller and an adjustable roller structure, and adjusts the roller gap through a hydraulic system, achieving rapid adjustment of the roller gap and adjustment without stopping the machine.

Description

Technical Field

[0001] The invention relates to a roller gap control system, in particular to a control system for semi-automatically adjusting the roller gap of a double-roller sand making machine. Background Art

[0002] The double-roller sand making machine is an important equipment for crushing sand and gravel in mines. The working environment of mine sand and gravel is harsh, the sand making and crushing equipment is heavy, and the gap adjustment of the double-roller rollers is difficult after the rollers are worn. The existing adjustment of the gap between the double-roller sand making machines mainly adopts mechanical adjustment by stopping the machine. This mechanical adjustment method mainly relies on moving the rollers, but the rollers are extremely heavy, and there is no special equipment and it is difficult to adjust the position. Moreover, the adjustment requires professionals and takes a lot of time to complete the adjustment. The equipment maintenance cost is extremely high, and the requirements for operators are higher. How to reduce the equipment maintenance cost and reduce the technical requirements for operators to adjust the roller gap is the object of research for technical personnel in this field.

[0003] Chinese invention patent No. 201710743665.5 discloses a sand making machine, including a housing, a bracket located in the housing, a fixed roller device, a movable roller device and a pressure regulating device arranged on the bracket; the fixed roller device includes a fixed roller rotatably arranged on the bracket, the movable roller device includes 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 mutually matching wavy tooth surfaces; the movable roller and the driving device are arranged on the bearing seat; and pulleys and rails are respectively provided between the bearing seat and the bracket for sliding connection. Although this type of sand making machine adopts a hydraulic pressure regulating device to adjust the movable roller device, the technical means it adopts are limited to hydraulic cylinders. For such large-scale equipment, ordinary hydraulic cylinders are completely unable to adjust the pressure, and a special hydraulic system is required to achieve adjustment. The above technology does not disclose an adjustment plan, let alone an adjustment plan without stopping the machine. Summary of the invention

[0004] The invention provides a control system for semi-automatically adjusting the gap between rollers of a double-roller sand making machine with a long service life and a non-stop adjustment function.

[0005] A control system for semi-automatically adjusting the roller gap of a roller sand making machine includes a fixed roller with a roller gap and an adjustable roller. The adjustable roller is installed on a movable mounting seat, and the movable mounting seat is connected to the top rod of the main hydraulic cylinder. The top rod of the main hydraulic cylinder is controlled by the hydraulic system. The top rod of the main hydraulic cylinder moves forward and backward to adjust the roller gap. The roller gap includes a first adjustment gap when the roller sand making machine is stopped and a second adjustment gap when the roller sand making machine is started. The first adjustment gap is controlled by the top rod of the main hydraulic cylinder, and the second adjustment gap is controlled by the auxiliary hydraulic cylinder and the top rod of the main hydraulic cylinder. This control system adopts the first adjustment gap when the roller sand making machine is stopped and the second adjustment gap when the roller sand making machine is started, so as to realize the rapid adjustment of the first adjustment gap of the roller gap when the roller gap is stopped, and the fine adjustment of the second adjustment gap of the roller gap when the roller sand making machine is started while crushing stones.

[0006] The hydraulic system includes an oil tank, and 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 main hydraulic cylinder push rod, and a secondary oil circuit control system for controlling the stroke of the auxiliary hydraulic cylinder push rod. The main oil circuit control system and the secondary oil circuit control system ensure that the main hydraulic cylinder obtains the thrust control required to push the adjustable roller.

[0007] The main oil circuit control system includes an oil pump and an electromagnetic overflow valve, a second solenoid valve, and a third solenoid valve connected in the oil circuit. The second solenoid valve is provided with a switch 4CT and a switch 5CT, and the third solenoid valve is provided with a switch 6CT and a switch 7CT; the switch 4CT controls the P port and the A port on the second solenoid valve, the P port oil circuit is connected to the oil pump as the oil inlet, and the A port is connected to the D port on the hydraulically controlled one-way valve; the switch 5CT controls the T port and the B port on the second solenoid valve, the T port oil circuit is connected to the oil tank, and the B port is connected to the B port on the master hydraulic cylinder through the D port on the hydraulically controlled one-way valve.

[0008] The switch 6CT controls the P port and the A port on the third solenoid valve. The P port oil circuit is connected to the oil pump as the oil inlet, and the A port is connected to the A port on the second check valve, the A port on the second relief valve, and the A port on the main hydraulic cylinder in sequence; the switch 7CT controls the T port and the B port on the third solenoid valve. The T port oil circuit is connected to the oil tank and the T port on the second relief valve. This main oil circuit control system ensures the oil circuit pressure through the oil pump and the electromagnetic relief valve, the second solenoid valve, and the third solenoid valve. The second solenoid valve and the third solenoid valve are used to cooperate with the hydraulic control check valve, the second relief valve, and the second check valve to jointly realize the power output control performance of the main hydraulic cylinder push rod under the high pressure of the oil pump.

[0009] The auxiliary oil circuit control system includes an oil pump, an electromagnetic overflow valve and a first electromagnetic valve connected by the oil circuit. The first electromagnetic valve is provided with a switch 2CT and a switch 3CT. The switch 2CT controls the P port and the A port on the first electromagnetic valve. The P port oil circuit is connected to the oil pump as the oil inlet. The A port is sequentially connected to the A port on the first overflow valve, the A port on the first check valve, the A port on the auxiliary hydraulic cylinder and the B port on the main hydraulic cylinder. The switch 3CT controls the T port and the B port on the first electromagnetic valve. The T port is connected to the oil tank through the T port oil circuit on the first overflow valve, and the B port is connected to the B port on the auxiliary hydraulic cylinder through the B port on the first overflow valve. This auxiliary oil circuit control system realizes the micro-power adjustment output control performance of the main hydraulic cylinder push rod under the high pressure of the oil pump without stopping the machine through the oil pump, the electromagnetic overflow valve and the first electromagnetic valve on the basis of the main oil circuit control system.

[0010] The auxiliary oil circuit control system further comprises a first travel switch and a second travel switch cooperating with the auxiliary hydraulic cylinder upper push rod. The first travel switch and the second travel switch cooperate to adjust the distance of the auxiliary hydraulic cylinder upper push rod relative to the main hydraulic cylinder push rod travel.

[0011] The electromagnetic overflow valve is provided with an electromagnetic switch 1CT, which controls the electromagnetic overflow valve to be in direct oil discharge mode or in oil pressure maintenance oil supply mode. In direct oil discharge mode, the oil output by the oil pump flows directly into the oil tank through the electromagnetic overflow valve, and in oil pressure maintenance oil supply mode, the oil output by the oil pump enters the hydraulic system. The electromagnetic overflow valve structure ensures that the control system maintains power and outputs power for the adjustable roller.

[0012] A control method for semi-automatically adjusting the gap between rollers of a double-roller sand making machine includes the following four state switching adjustments:

[0013] Status: One pair of roller sand making machine is shut down to shorten the roller gap: the two-roller sand making machine is shut down, the oil pump is turned on, the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then the electromagnetic switch 1CT is turned on to close the direct oil outlet mode of the electromagnetic overflow valve, and the oil pressure maintaining oil supply mode is turned on to make the hydraulic oil flow directly from the oil pump outlet to the P port of the second solenoid valve, and the switch 5CT is turned on to flow out from the B port of the second solenoid valve to the hydraulically controlled one-way valve, and then flow out from the D port of the hydraulically controlled one-way valve, and flow into the B port of the main hydraulic cylinder to enter the working pressure chamber. The oil pressure at the B port of the working pressure chamber is greater than the oil pressure at the A port of the return oil pressure chamber and the total external resistance of the push rod. When the force is applied, the oil in the working pressure chamber pushes the push rod to move right, that is, drives the mobile mounting seat to move right, shortening the roller gap; during the right movement of the mobile mounting seat, the oil pressure at port A of the return oil pressure chamber of the main hydraulic cylinder increases, and the excess hydraulic oil flows out from port A to port A of the second relief valve. When the oil pressure reaches the set opening pressure of the second relief valve, the valve of the second relief valve is pushed open, and the oil flows out from port T of the second relief valve and flows into the oil tank. After the work is completed, the switch 5CT of the second solenoid valve is closed to stop supplying oil to the main hydraulic cylinder. The pressure of the oil circuit increases, and the valve of the electromagnetic relief valve is pushed open, so that the excess hydraulic oil passes through the electromagnetic relief valve and flows into the oil tank.

[0014] State 2: The roller sand making machine is shut down to expand the roller gap: The roller sand making machine is shut down, the oil pump is turned on, and the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and the electromagnetic switch 1CT is turned on to close the electromagnetic overflow valve to the direct oil outlet mode, and the oil pressure maintaining oil supply mode is turned on to make the hydraulic oil flow directly from the oil pump outlet to the P port of the third solenoid valve, and the switch 6CT is turned on, and the hydraulic oil flows out from the A port of the third solenoid valve. When the oil pressure of the A port of the third solenoid valve is greater than the oil pressure of the A port of the second one-way valve, the second one-way valve is pushed open, and the oil flows out from the A port of the second one-way valve, flows into the A port of the main hydraulic cylinder and enters the return oil pressure chamber. When the oil pressure of the A port of the return oil pressure chamber is greater than the oil pressure of the B port of the working pressure chamber, the oil in the return oil pressure chamber pushes the push rod to move left, that is, drives the movable mounting seat to move left, thereby expanding the roller gap; during the movement of the movable mounting seat to the left, the main The oil pressure in the working pressure chamber of the hydraulic cylinder increases, and the excess hydraulic oil flows out from the B port of the main hydraulic cylinder and flows to the D port of the hydraulic control one-way valve. At the same time, the switch 4CT of the second solenoid valve is opened, so that the hydraulic oil flows in from the P port of the second solenoid valve and flows out from the A port to the A port of the hydraulic control one-way valve. The oil pressure at the A port increases, and after reaching the opening pressure of the hydraulic control one-way valve, the valve of the hydraulic control one-way valve is pushed open, so that the oil circuit of the D port of the hydraulic control one-way valve is connected, and the hydraulic oil in the main hydraulic cylinder circuit flows into the B port of the second solenoid valve through the B port of the hydraulic control one-way valve, and flows out from the T port of the second solenoid valve and flows into the oil tank. After the work is completed, the switch 6CT of the third solenoid valve and the switch 4CT of the second solenoid valve are closed to stop supplying oil to the main hydraulic cylinder. The pressure of the oil circuit increases, and the valve of the electromagnetic overflow valve is pushed open, so that the excess hydraulic oil passes through the electromagnetic overflow valve and flows into the oil tank;

[0015] Status: The three-roller sand-making machine does not stop to reduce the roller gap: the roller sand-making machine does not stop, turn on the oil pump, the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then turn on the electromagnetic switch 1CT to close the direct oil outlet mode of the electromagnetic overflow valve, turn on the oil pressure maintaining oil supply mode, so that the hydraulic oil flows directly from the oil pump to the P port of the first solenoid valve, turn on the switch 3CT of the first solenoid valve, and flow out from the B port of the first solenoid valve, flow into the B port of the auxiliary hydraulic cylinder and enter the working pressure chamber of the auxiliary hydraulic cylinder. When the oil pressure at the B port is greater than the oil pressure in the return oil pressure chamber of the auxiliary hydraulic cylinder, the oil in the working pressure chamber pushes the top rod of the auxiliary hydraulic cylinder to move right, and the oil pressure in the return oil pressure chamber increases. When the auxiliary hydraulic cylinder When the oil pressure at port A of the return oil pressure chamber of the hydraulic cylinder is greater than that at port B of the main hydraulic cylinder, the hydraulic oil flows out from port A of the auxiliary hydraulic cylinder, pushes open the hydraulically controlled one-way valve, flows out from port D of the hydraulically controlled one-way valve, and flows into port B of the main hydraulic cylinder. When the oil pressure at port B is greater than that at port A of the main hydraulic cylinder, the oil in the working pressure chamber of the main hydraulic cylinder pushes the push rod to move right, that is, drives the movable mounting seat to move right, thereby reducing the roller gap. When the push rod of the auxiliary hydraulic cylinder hits the second stroke switch, the second stroke switch controls the closure of the first solenoid valve switch 3CT, stops supplying oil to the auxiliary hydraulic cylinder, and causes the pressure in the oil circuit to increase, pushing open the valve of the electromagnetic overflow valve, allowing excess hydraulic oil to pass through the electromagnetic overflow valve and flow into the oil tank.

[0016] Status: The four-roller sand making machine does not stop and continuously reduces the roller gap: the roller sand making machine does not stop, turn on the oil pump, and the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then turn on the electromagnetic switch 1CT to close the electromagnetic overflow valve to the direct oil outlet mode, turn on the oil pressure maintaining oil supply mode, so that the hydraulic oil flows directly from the oil pump to the P port of the first electromagnetic valve, turn on the electromagnetic switch 2CT, and flow out from the A port of the first solenoid valve. The hydraulic oil flows through the A port of the first overflow valve. When the oil pressure is less than the set pressure of the first overflow valve, the first overflow valve is closed, and the hydraulic oil flows directly to the first check valve. When the oil pressure is greater than the set pressure of the first overflow valve, the first overflow valve is opened, and the hydraulic oil flows into the oil tank through the T port of the first overflow valve;

[0017] When the hydraulic oil flows to the first one-way valve, and the oil pressure of port A of the first solenoid valve is greater than the oil pressure of port A of the first one-way valve, the first one-way valve is pushed open and the oil flows out from port A of the first one-way valve. When the oil pressure of port A of the first solenoid valve is greater than the oil pressure of port A of the auxiliary hydraulic cylinder, and the oil pressure of port A of the first solenoid valve is less than the oil pressure of port B of the main hydraulic cylinder, the hydraulic oil flows out from port A of the first one-way valve, flows into port A of the auxiliary hydraulic cylinder and enters the return oil pressure chamber. The oil in the return oil pressure chamber pushes the push rod of the auxiliary hydraulic cylinder to move left, and the auxiliary hydraulic cylinder The oil pressure at the B port increases, and the excess hydraulic oil flows out from the B port of the auxiliary hydraulic cylinder through the pipeline, flows through the B port and T port of the first solenoid valve, and flows into the oil tank. During the left movement of the auxiliary hydraulic cylinder's push rod, when the push rod travel block of the auxiliary hydraulic cylinder hits the first travel switch, the switch 2CT is closed, and the oil supply to the auxiliary hydraulic cylinder is stopped. The pressure of the oil circuit increases, and the valve of the electromagnetic overflow valve is opened, so that the excess hydraulic oil passes through the electromagnetic overflow valve and flows into the oil tank. Then state three and state four are circulated to continuously reduce the roller gap.

[0018] The present invention adopts four states: shortening the roller gap when the double-roller sand-making machine is stopped, expanding the roller gap when the double-roller sand-making machine is stopped, reducing the roller gap without stopping the double-roller sand-making machine, and continuously reducing the roller gap when the double-roller sand-making machine is not stopped. It can achieve fast and accurate adjustment of the roller gap, ensure the stability of the sand and gravel quality of the double-roller sand-making machine, reduce the technical requirements for operators, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] Figure 1 The present invention is a schematic diagram of the oil circuit structure of a control system for semi-automatically adjusting the gap between rollers of a double-roller sand making machine. Specific implementation plan

[0021] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0022] See also Figure 1 A control system for semi-automatically adjusting the roller gap of a double-roller sand making machine comprises a fixed roller 7 with a roller gap and an adjustable roller 6, wherein the adjustable roller 6 is mounted on a movable mounting seat 8, and the movable mounting seat 8 is connected to a push rod of a main hydraulic cylinder 5, wherein the push rod of the main hydraulic cylinder 5 is controlled by a hydraulic system, and the push rod of the main hydraulic cylinder 5 moves back and forth to adjust the roller gap 1.

[0023] The roller gap 1 is adjusted in two states: one is the first adjustment gap when the roller sand making machine is stopped, and the other is the second adjustment gap when the roller sand making machine is started; the first adjustment gap is a quick adjustment gap, and the second adjustment gap is a fine adjustment based on the first adjustment gap, which is an adjustment without stopping the machine. The first adjustment gap is controlled by the push rod of the main hydraulic cylinder 5, and the second adjustment gap is controlled by the auxiliary hydraulic cylinder 2 and the push rod of the main hydraulic cylinder 5.

[0024] As a preferred structure, the hydraulic system includes an oil tank, which is respectively connected to an oil pump, an electromagnetic overflow valve, a main oil circuit control system for controlling the ejector stroke of the main hydraulic cylinder 5, and an auxiliary oil circuit control system for controlling the ejector stroke of the auxiliary hydraulic cylinder 2.

[0025] The main oil circuit control system includes an oil pump and an electromagnetic overflow valve, a second solenoid valve and a third solenoid valve connected to the oil circuit. The second solenoid valve is provided with a switch 4CT and a switch 5CT, and the third solenoid valve is provided with a switch 6CT and a switch 7CT; the switch 4CT controls the P port and the A port on the second solenoid valve, the P port oil circuit is connected to the oil pump as the oil inlet, the A port is connected to the D port on the hydraulically controlled one-way valve, the switch 5CT controls the T port and the B port on the second solenoid valve, the T port oil circuit is connected to the oil tank, and the B port is connected to the B port on the master hydraulic cylinder 5 through the D port on the hydraulically controlled one-way valve.

[0026] Switch 6CT controls the P port and A port on the third solenoid valve. The P port oil circuit is connected to the oil pump as the oil inlet. The A port is connected to the A port on the second one-way valve, the A port on the second relief valve and the A port on the master hydraulic cylinder 5 in sequence. Switch 7CT controls the T port and B port on the third solenoid valve. The T port oil circuit is connected to the oil tank and the T port on the second relief valve.

[0027] As a preferred structure, the auxiliary oil circuit control system includes an oil pump, an electromagnetic overflow valve and a first solenoid valve connected to the oil circuit. The first solenoid valve is provided with a switch 2CT and a switch 3CT. The switch 2CT controls the P port and the A port on the first solenoid valve. The P port oil circuit is connected to the oil pump as the oil inlet. The A port is connected to the A port on the first overflow valve, the A port on the first check valve, the A port on the auxiliary hydraulic cylinder 2 and the B port on the main hydraulic cylinder 5 in sequence. The switch 3CT controls the T port and the B port on the first solenoid valve. The T port is connected to the oil tank through the T port oil circuit on the first overflow valve, and the B port is connected to the B port on the auxiliary hydraulic cylinder 2 through the B port on the first overflow valve.

[0028] In order to achieve the stroke adjustment of the push rod of the auxiliary hydraulic cylinder 2, the auxiliary oil circuit control system also includes a first stroke switch 3 and a second stroke switch 4 that cooperate with the push rod of the auxiliary hydraulic cylinder 2.

[0029] In order to achieve the pressure maintaining capacity of the entire 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 direct oil outlet mode or in oil pressure maintaining oil supply mode. In direct oil outlet mode, the oil output by the oil pump flows directly into the oil tank through the electromagnetic overflow valve, and in oil pressure maintaining oil supply mode, the oil output by the oil pump enters the hydraulic system.

[0030] A control method for semi-automatically adjusting the gap between rollers of a double-roller sand making machine includes the following four state switching adjustments:

[0031] Status: One pair of roller sand making machine is shut down to shorten the roller gap: the two-roller sand making machine is shut down, the oil pump is turned on, the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then the electromagnetic switch 1CT is turned on to close the direct oil outlet mode of the electromagnetic overflow valve, and the oil pressure maintaining oil supply mode is turned on to make the hydraulic oil flow directly from the oil pump outlet to the P port of the second solenoid valve, and the switch 5CT is turned on to flow out from the B port of the second solenoid valve to the hydraulically controlled one-way valve, and then flow out from the D port of the hydraulically controlled one-way valve, and flow into the B port of the main hydraulic cylinder to enter the working pressure chamber. The oil pressure at the B port of the working pressure chamber is greater than the oil pressure at the A port of the return oil pressure chamber and the total external resistance of the push rod. When the force is applied, the oil in the working pressure chamber pushes the push rod to move right, that is, drives the mobile mounting seat to move right, shortening the roller gap; during the right movement of the mobile mounting seat, the oil pressure at port A of the return oil pressure chamber of the main hydraulic cylinder increases, and the excess hydraulic oil flows out from port A to port A of the second relief valve. When the oil pressure reaches the set opening pressure of the second relief valve, the valve of the second relief valve is pushed open, and the oil flows out from port T of the second relief valve and flows into the oil tank. After the work is completed, the switch 5CT of the second solenoid valve is closed to stop supplying oil to the main hydraulic cylinder. The pressure of the oil circuit increases, and the valve of the electromagnetic relief valve is pushed open, so that the excess hydraulic oil passes through the electromagnetic relief valve and flows into the oil tank.

[0032] State 2: The roller sand making machine is shut down to expand the roller gap: The roller sand making machine is shut down, the oil pump is turned on, and the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and the electromagnetic switch 1CT is turned on to close the electromagnetic overflow valve to the direct oil outlet mode, and the oil pressure maintaining oil supply mode is turned on to make the hydraulic oil flow directly from the oil pump outlet to the P port of the third solenoid valve, and the switch 6CT is turned on, and the hydraulic oil flows out from the A port of the third solenoid valve. When the oil pressure of the A port of the third solenoid valve is greater than the oil pressure of the A port of the second one-way valve, the second one-way valve is pushed open, and the oil flows out from the A port of the second one-way valve, flows into the A port of the main hydraulic cylinder and enters the return oil pressure chamber. When the oil pressure of the A port of the return oil pressure chamber is greater than the oil pressure of the B port of the working pressure chamber, the oil in the return oil pressure chamber pushes the push rod to move left, that is, drives the movable mounting seat to move left, thereby expanding the roller gap; during the movement of the movable mounting seat to the left, the main The oil pressure in the working pressure chamber of the hydraulic cylinder increases, and the excess hydraulic oil flows out from the B port of the main hydraulic cylinder and flows to the D port of the hydraulic control one-way valve. At the same time, the switch 4CT of the second solenoid valve is opened, so that the hydraulic oil flows in from the P port of the second solenoid valve and flows out from the A port to the A port of the hydraulic control one-way valve. The oil pressure at the A port increases, and after reaching the opening pressure of the hydraulic control one-way valve, the valve of the hydraulic control one-way valve is pushed open, so that the oil circuit of the D port of the hydraulic control one-way valve is connected, and the hydraulic oil in the main hydraulic cylinder circuit flows into the B port of the second solenoid valve through the B port of the hydraulic control one-way valve, and flows out from the T port of the second solenoid valve and flows into the oil tank. After the work is completed, the switch 6CT of the third solenoid valve and the switch 4CT of the second solenoid valve are closed to stop supplying oil to the main hydraulic cylinder. The pressure of the oil circuit increases, and the valve of the electromagnetic overflow valve is pushed open, so that the excess hydraulic oil passes through the electromagnetic overflow valve and flows into the oil tank;

[0033] Status: The three-roller sand-making machine does not stop to reduce the roller gap: the roller sand-making machine does not stop, turn on the oil pump, the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then turn on the electromagnetic switch 1CT to close the direct oil outlet mode of the electromagnetic overflow valve, turn on the oil pressure maintaining oil supply mode, so that the hydraulic oil flows directly from the oil pump to the P port of the first solenoid valve, turn on the switch 3CT of the first solenoid valve, and flow out from the B port of the first solenoid valve, flow into the B port of the auxiliary hydraulic cylinder and enter the working pressure chamber of the auxiliary hydraulic cylinder. When the oil pressure at the B port is greater than the oil pressure in the return oil pressure chamber of the auxiliary hydraulic cylinder, the oil in the working pressure chamber pushes the top rod of the auxiliary hydraulic cylinder to move right, and the oil pressure in the return oil pressure chamber increases. When the auxiliary hydraulic cylinder When the oil pressure at port A of the return oil pressure chamber of the hydraulic cylinder is greater than that at port B of the main hydraulic cylinder, the hydraulic oil flows out from port A of the auxiliary hydraulic cylinder, pushes open the hydraulically controlled one-way valve, flows out from port D of the hydraulically controlled one-way valve, and flows into port B of the main hydraulic cylinder. When the oil pressure at port B is greater than that at port A of the main hydraulic cylinder, the oil in the working pressure chamber of the main hydraulic cylinder pushes the push rod to move right, that is, drives the movable mounting seat to move right, thereby reducing the roller gap. When the push rod of the auxiliary hydraulic cylinder hits the second stroke switch, the second stroke switch controls the closure of the first solenoid valve switch 3CT, stops supplying oil to the auxiliary hydraulic cylinder, and causes the pressure in the oil circuit to increase, pushing open the valve of the electromagnetic overflow valve, allowing excess hydraulic oil to pass through the electromagnetic overflow valve and flow into the oil tank.

[0034] Status: The four-roller sand making machine does not stop and continuously reduces the roller gap: the roller sand making machine does not stop, turn on the oil pump, and the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then turn on the electromagnetic switch 1CT to close the electromagnetic overflow valve to the direct oil outlet mode, turn on the oil pressure maintaining oil supply mode, so that the hydraulic oil flows directly from the oil pump to the P port of the first electromagnetic valve, turn on the electromagnetic switch 2CT, and flow out from the A port of the first solenoid valve. The hydraulic oil flows through the A port of the first overflow valve. When the oil pressure is less than the set pressure of the first overflow valve, the first overflow valve is closed, and the hydraulic oil flows directly to the first check valve. When the oil pressure is greater than the set pressure of the first overflow valve, the first overflow valve is opened, and the hydraulic oil flows into the oil tank through the T port of the first overflow valve;

[0035] When the hydraulic oil flows to the first one-way valve, and the oil pressure of port A of the first solenoid valve is greater than the oil pressure of port A of the first one-way valve, the first one-way valve is pushed open and the oil flows out from port A of the first one-way valve. When the oil pressure of port A of the first solenoid valve is greater than the oil pressure of port A of the auxiliary hydraulic cylinder, and the oil pressure of port A of the first solenoid valve is less than the oil pressure of port B of the main hydraulic cylinder, the hydraulic oil flows out from port A of the first one-way valve, flows into port A of the auxiliary hydraulic cylinder and enters the return oil pressure chamber. The oil in the return oil pressure chamber pushes the push rod of the auxiliary hydraulic cylinder to move left, and the auxiliary hydraulic cylinder The oil pressure at the B port increases, and the excess hydraulic oil flows out from the B port of the auxiliary hydraulic cylinder through the pipeline, flows through the B port and T port of the first solenoid valve, and flows into the oil tank. During the left movement of the auxiliary hydraulic cylinder's push rod, when the push rod travel block of the auxiliary hydraulic cylinder hits the first travel switch, the switch 2CT is closed, and the oil supply to the auxiliary hydraulic cylinder is stopped. The pressure of the oil circuit increases, and the valve of the electromagnetic overflow valve is opened, so that the excess hydraulic oil passes through the electromagnetic overflow valve and flows into the oil tank. Then state three and state four are circulated to continuously reduce the roller gap.

[0036] The above-mentioned method for adjusting the gap between the rollers of the double-roller sand making machine ensures the hydraulic power output by the oil pump, maintains pressure and makes fine adjustments on the basis of achieving the adjustment of the gap between the rollers. Not only can the gap between the rollers be adjusted while the machine is stopped, but the gap between the rollers can also be fine-tuned to overcome the stone crushing pressure while the machine is turned on, thereby ensuring the quality of sand making, that is, ensuring the uniformity of sand particles.

[0037] As a preferred adjustment method, the second stroke switch can adjust the stroke length of the auxiliary hydraulic cylinder push rod, corresponding to the adjustment stroke of the main hydraulic cylinder push rod. When the auxiliary hydraulic cylinder push rod is automatically fed, the push rod automatically retreats after hitting the second stroke switch. When the auxiliary hydraulic cylinder push rod hits the first stroke switch, the oil supply to the auxiliary hydraulic cylinder is stopped. When the roller sand making machine is working, the PLC control panel controls the automatic feeding action of the auxiliary hydraulic cylinder at a fixed time to adjust the roller gap to further improve the uniformity of the crushed sand particles.

[0038] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A control system for semi-automatically adjusting the roller gap of a double-roller sand making machine, comprising a fixed roller (7) with a roller gap and an adjustable roller (6), characterized in that: The adjustable roller (6) is mounted on a movable mounting seat (8), the movable mounting seat (8) is connected to the push rod of the main hydraulic cylinder (5), the push rod of the main hydraulic cylinder (5) is controlled by the hydraulic system, the push rod of the main hydraulic cylinder (5) moves forward and backward to adjust the roller gap (1), the roller gap (1) includes a first adjustment gap when the roller sand making machine is stopped and a second adjustment gap when the roller sand making machine is started; the first adjustment gap is controlled by the push rod of the main hydraulic cylinder (5), and the second adjustment gap is controlled by the auxiliary hydraulic cylinder (2) in cooperation with the push rod of the main hydraulic cylinder (5); the hydraulic system includes an oil tank, and the oil tank is respectively connected to an oil pump, an electric motor and a hydraulic pump. A magnetic overflow valve, a main oil circuit control system for controlling the ejector rod stroke of a main hydraulic cylinder (5), and a secondary oil circuit control system for controlling the ejector rod stroke of a secondary hydraulic cylinder (2); the main oil circuit control system comprises an oil pump and an electromagnetic overflow valve, a second electromagnetic valve, and a third electromagnetic valve connected in the oil circuit; 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 7CT; the switch 4CT controls the P port and the A port on the second electromagnetic valve, the P port oil circuit is connected to the oil pump as an oil inlet, and the A port is connected to the D port on the hydraulic control one-way valve; the switch 5CT controls the T port and the B port on the second electromagnetic valve, the T port oil circuit is connected to the oil pump as an oil inlet, and the A port is connected to the D port on the hydraulic control one-way valve; the switch 5CT controls the T port and the B port on the second electromagnetic valve, and the T port oil circuit is connected to the oil pump as an oil inlet. The switch 6CT controls the P port and the A port on the third solenoid valve, the P port oil circuit is connected to the oil pump as the oil inlet, and the A port is connected in sequence to the A port on the second one-way valve, the A port on the second relief valve, and the A port on the master hydraulic cylinder (5); the switch 7CT controls the T port and the B port on the third solenoid valve, the T port oil circuit is connected to the oil tank and the T port on the second relief valve; the auxiliary oil circuit control system includes the oil pump, the electromagnetic relief valve, and the first solenoid valve connected in the oil circuit, and the first solenoid valve is provided with a switch 2CT and a switch 3CT; the The switch 2CT controls the P port and the A port on the first solenoid valve, the P port oil circuit is connected to the oil pump as the oil inlet, and the A port is connected in sequence to the A port on the first relief valve, the A port on the first non-return valve, the A port on the auxiliary hydraulic cylinder (2), and the B port on the main hydraulic cylinder (5); the switch 3CT controls the T port and the B port on the first solenoid valve, the T port is connected to the oil tank through the T port oil circuit on the first relief valve, and the B port is connected to the B port on the auxiliary hydraulic cylinder (2) through the B port on the first relief valve; the auxiliary oil circuit control system also includes a first travel switch (3) and a second travel switch (4) that cooperate with the upper push rod of the auxiliary hydraulic cylinder (2).

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

3. A control method for semi-automatically adjusting the gap between rollers of a double-roller sand making machine according to claim 1 or 2, characterized in that: The control method includes the following four state switching adjustments: Status: One pair of roller sand making machine is shut down to shorten the roller gap: the two-roller sand making machine is shut down, the oil pump is turned on, the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then the electromagnetic switch 1CT is turned on to close the direct oil outlet mode of the electromagnetic overflow valve, and the oil pressure maintaining oil supply mode is turned on to make the hydraulic oil flow directly from the oil pump outlet to the P port of the second solenoid valve, and the switch 5CT is turned on to flow out from the B port of the second solenoid valve to the hydraulically controlled one-way valve, and then flow out from the D port of the hydraulically controlled one-way valve, and flow into the B port of the main hydraulic cylinder to enter the working pressure chamber. The oil pressure at the B port of the working pressure chamber is greater than the oil pressure at the A port of the return oil pressure chamber and the total external resistance of the push rod. When the force is applied, the oil in the working pressure chamber pushes the push rod to move right, that is, drives the mobile mounting seat to move right, shortening the roller gap; during the right movement of the mobile mounting seat, the oil pressure at port A of the return oil pressure chamber of the main hydraulic cylinder increases, and the excess hydraulic oil flows out from port A to port A of the second relief valve. When the oil pressure reaches the set opening pressure of the second relief valve, the valve of the second relief valve is pushed open, and the oil flows out from port T of the second relief valve and flows into the oil tank. After the work is completed, the switch 5CT of the second solenoid valve is closed to stop supplying oil to the main hydraulic cylinder. The pressure of the oil circuit increases, and the valve of the electromagnetic relief valve is pushed open, so that the excess hydraulic oil passes through the electromagnetic relief valve and flows into the oil tank. State 2: The roller sand making machine is shut down to expand the roller gap: The roller sand making machine is shut down, the oil pump is turned on, and the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and the electromagnetic switch 1CT is turned on to close the electromagnetic overflow valve to the direct oil outlet mode, and the oil pressure maintaining oil supply mode is turned on to make the hydraulic oil flow directly from the oil pump outlet to the P port of the third solenoid valve, and the switch 6CT is turned on, and the hydraulic oil flows out from the A port of the third solenoid valve. When the oil pressure of the A port of the third solenoid valve is greater than the oil pressure of the A port of the second one-way valve, the second one-way valve is pushed open, and the oil flows out from the A port of the second one-way valve, flows into the A port of the main hydraulic cylinder and enters the return oil pressure chamber. When the oil pressure of the A port of the return oil pressure chamber is greater than the oil pressure of the B port of the working pressure chamber, the oil in the return oil pressure chamber pushes the push rod to move left, that is, drives the movable mounting seat to move left, thereby expanding the roller gap; during the movement of the movable mounting seat to the left, the main The oil pressure in the working pressure chamber of the hydraulic cylinder increases, and the excess hydraulic oil flows out from the B port of the main hydraulic cylinder and flows to the D port of the hydraulic control one-way valve. At the same time, the switch 4CT of the second solenoid valve is opened, so that the hydraulic oil flows in from the P port of the second solenoid valve and flows out from the A port to the A port of the hydraulic control one-way valve. The oil pressure at the A port increases, and after reaching the opening pressure of the hydraulic control one-way valve, the valve of the hydraulic control one-way valve is pushed open, so that the oil circuit of the D port of the hydraulic control one-way valve is connected, and the hydraulic oil in the main hydraulic cylinder circuit flows into the B port of the second solenoid valve through the B port of the hydraulic control one-way valve, and flows out from the T port of the second solenoid valve and flows into the oil tank. After the work is completed, the switch 6CT of the third solenoid valve and the switch 4CT of the second solenoid valve are closed to stop supplying oil to the main hydraulic cylinder. The pressure of the oil circuit increases, and the valve of the electromagnetic overflow valve is pushed open, so that the excess hydraulic oil passes through the electromagnetic overflow valve and flows into the oil tank; Status: The three-roller sand-making machine does not stop to reduce the roller gap: the roller sand-making machine does not stop, turn on the oil pump, and the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then turn on the electromagnetic switch 1CT to close the direct oil outlet mode of the electromagnetic overflow valve, and turn on the oil pressure maintaining oil supply mode, so that the hydraulic oil flows directly from the oil pump outlet to the P port of the first electromagnetic valve, and turn on the switch 3CT of the first solenoid valve, and flows out from the B port of the first solenoid valve, flows into the B port of the auxiliary hydraulic cylinder and enters the working pressure chamber of the auxiliary hydraulic cylinder. When the oil pressure at port B is greater than the oil pressure in the return oil pressure chamber of the auxiliary hydraulic cylinder, the oil in the working pressure chamber pushes the push rod of the auxiliary hydraulic cylinder to move right, and the oil pressure in the return oil pressure chamber increases. When the oil pressure at port A of the return oil pressure chamber of the auxiliary hydraulic cylinder is greater than that at port B of the main hydraulic cylinder, the hydraulic oil flows out from port A of the auxiliary hydraulic cylinder, pushes open the hydraulic control one-way valve, and flows out from port D of the hydraulic control one-way valve to port B of the main hydraulic cylinder. When the port oil pressure is greater than the A port oil pressure of the main hydraulic cylinder, the oil in the working pressure chamber of the main hydraulic cylinder pushes the push rod to move right, that is, drives the movable mounting seat to move right, and reduces the roller gap. When the push rod of the auxiliary hydraulic cylinder hits the second stroke switch, the second stroke switch controls the closing of the first solenoid valve switch 3CT, stops supplying oil to the auxiliary hydraulic cylinder, and the pressure of the oil circuit increases, pushing open the valve of the electromagnetic overflow valve, so that the excess hydraulic oil passes through the electromagnetic overflow valve and flows into the oil tank; Status: The four-roller sand making machine does not stop and continuously reduces the roller gap: the roller sand making machine does not stop, turn on the oil pump, and the hydraulic oil output by the oil pump flows directly through the electromagnetic overflow valve into the oil tank, and then turn on the electromagnetic switch 1CT to close the electromagnetic overflow valve to the direct oil outlet mode, turn on the oil pressure maintaining oil supply mode, so that the hydraulic oil flows directly from the oil pump to the P port of the first electromagnetic valve, turn on the electromagnetic switch 2CT, and flow out from the A port of the first solenoid valve. The hydraulic oil flows through the A port of the first overflow valve. When the oil pressure is less than the set pressure of the first overflow valve, the first overflow valve is closed, and the hydraulic oil flows directly to the first check valve. When the oil pressure is greater than the set pressure of the first overflow valve, the first overflow valve is opened, and the hydraulic oil flows into the oil tank through the T port of the first overflow valve; When the hydraulic oil flows to the first one-way valve, and the oil pressure of port A of the first solenoid valve is greater than the oil pressure of port A of the first one-way valve, the first one-way valve is pushed open and the oil flows out from port A of the first one-way valve. When the oil pressure of port A of the first solenoid valve is greater than the oil pressure of port A of the auxiliary hydraulic cylinder, and the oil pressure of port A of the first solenoid valve is less than the oil pressure of port B of the main hydraulic cylinder, the hydraulic oil flows out from port A of the first one-way valve, flows into port A of the auxiliary hydraulic cylinder and enters the return oil pressure chamber. The oil in the return oil pressure chamber pushes the push rod of the auxiliary hydraulic cylinder to move left, and the auxiliary hydraulic cylinder The oil pressure at the B port increases, and the excess hydraulic oil flows out from the B port of the auxiliary hydraulic cylinder through the pipeline, flows through the B port and T port of the first solenoid valve, and flows into the oil tank. During the left movement of the auxiliary hydraulic cylinder's push rod, when the push rod travel block of the auxiliary hydraulic cylinder hits the first travel switch, the switch 2CT is closed, and the oil supply to the auxiliary hydraulic cylinder is stopped. The pressure of the oil circuit increases, and the valve of the electromagnetic overflow valve is opened, so that the excess hydraulic oil passes through the electromagnetic overflow valve and flows into the oil tank. Then state three and state four are circulated to continuously reduce the roller gap.

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