A replenishment machine hydraulic system

Abstract

The present application aims at the problem that the hydraulic system in the refilling machine device does not match the refilling machine, and provides a refilling machine hydraulic system, which comprises a motor, a hydraulic pump, an oil tank, a control valve group and a hydraulic oil circuit, wherein the control valve group comprises a first sensor, a second sensor, an electrical control box and an electromagnetic reversing valve; wherein the two sensors convert the position information of the piston rod reaching the two ends into electrical signals and transmit them to the electrical control box; the electromagnetic reversing valve is connected with the electrical control box and separates the two oil circuits into a main oil circuit, a return oil circuit and two working oil circuits; after the electrical control box receives the position information of the piston rod, the connection ports of the two working oil circuits are switched through the electromagnetic reversing valve to control the oil flow direction of the hydraulic oil circuit, so that the piston rod reciprocates and extrudes the raw materials in the discharging cylinder to the work station to perform the refilling work; the hydraulic components of the present application are reasonably matched, the design is scientific, the operation is stable, and the effect of prolonging the working time of the hydraulic system is remarkable.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic oil cylinders of injection molding machines, and particularly relates to a hydraulic system of a material supplementing machine. BACKGROUND

[0002] In the injection molding industry, material supplementing machines are widely used for processing large flange products of PE materials. At present, hydraulic oil cylinders are commonly used to realize the movement of the piston of the material supplementing cylinder. As one of the core components of the material supplementing machine, the running stability and reliability of the hydraulic oil cylinder determine the working efficiency and safety of the entire device.

[0003] The current hydraulic system directly controls the reciprocating movement of the piston rod in the hydraulic oil cylinder through a hydraulic pump station, so that the material supplementing machine is used for material supplementing work. However, the hydraulic system is relatively simple and needs to be designed to match the control of the material supplementing machine to realize stable operation. SUMMARY

[0004] The purpose of the present application is to solve the problem of mismatch between the existing hydraulic system and the material supplementing machine, and to provide a hydraulic system of a material supplementing machine.

[0005] To achieve the above purpose, the technical solution provided by the present application is as follows:

[0006] A hydraulic system of a material supplementing machine,

[0007] The material supplementing machine comprises a pushing cylinder, a discharging cylinder and a hydraulic system.

[0008] The pushing cylinder and the discharging cylinder are coaxially arranged, and each has a piston in the cylinder.

[0009] The pistons of the pushing cylinder and the discharging cylinder are coaxial and share one piston rod. One end of the piston rod is connected to the piston of the pushing cylinder, which divides the pushing cylinder into a first rodless cavity and a first rod cavity. The other end of the piston rod is connected to the piston of the discharging cylinder, which divides the discharging cylinder into a second rod cavity and a second rodless cavity.

[0010] The second rodless cavity is provided with an inlet and an outlet, and the outlet direction is parallel to the piston rod. The inlet is provided with a first one-way valve. After the raw material enters the second rodless cavity through the inlet, it is extruded by the piston through the outlet.

[0011] The special feature is that:

[0012] The hydraulic system comprises a motor, a hydraulic pump, an oil tank, a control valve group and a hydraulic oil circuit.

[0013] The hydraulic pump and the oil tank are connected, the hydraulic pump is arranged on the hydraulic oil circuit, and the motor drives the hydraulic pump to run, so as to draw oil from the oil tank to supply oil to the hydraulic oil circuit. The hydraulic oil circuit comprises two oil circuits which are respectively communicated with the first rodless cavity and the first rod cavity of the pushing cylinder.

[0014] The control valve group comprises a first sensor, a second sensor, an electrical control box and an electromagnetic reversing valve;

[0015] The first sensor and the second sensor are arranged between the push cylinder and the discharge cylinder, and are arranged at both ends of the reciprocating route of the piston rod and connected with the electrical control box. The two sensors convert the position information of the piston rod reaching both ends into electrical signals and transmit them to the electrical control box. After receiving the position information of the piston rod, the electrical control box controls the flow direction of the hydraulic oil to make the piston rod reciprocate. The stroke of the reciprocating movement of the piston rod is less than or equal to the length of the discharge cylinder.

[0016] The electromagnetic reversing valve is connected with the electrical control box and arranged on both oil routes at the same time, and divides the two oil routes into a main oil route, a return oil route, a first working oil route and a second working oil route. When the piston rod reaches both ends of the reciprocating route, the first sensor or the second sensor generates an electrical signal and transmits it to the electrical control box. The electrical control box controls the electromagnetic reversing valve to switch the connection port of the two working oil routes, so that the oil in the first working oil route and the second working oil route flows in opposite directions.

[0017] Further,

[0018] The first sensor and the second sensor are both inductive proximity switches. The piston rod is provided with an induction ring, which can cooperate with the two inductive proximity switches, so that when the piston rod reaches both ends of the reciprocating route, the inductive proximity switch generates an electrical signal.

[0019] Further,

[0020] The control valve group further comprises a bidirectional hydraulic lock, a one-way throttle valve, a second one-way valve, an overflow valve, an oil return filter and two stop valves.

[0021] The bidirectional hydraulic lock is arranged between the first working oil route and the second working oil route; the one-way throttle valve is arranged between the first working oil route and the second working oil route.

[0022] The hydraulic pump and the second one-way valve are arranged on the main oil route, and the oil return filter is arranged on the return oil route.

[0023] The overflow valve is arranged on the main oil route and the return oil route.

[0024] The first working oil route and the second working oil route are each provided with a release oil route connected with the oil tank, and the two stop valves are arranged on the two release oil routes respectively.

[0025] Further,

[0026] The oil tank is provided with a liquid temperature and liquid level meter and an air filter.

[0027] The main oil circuit is provided with a pressure gauge.

[0028] The oil return filter is provided with a pollution transmitter.

[0029] Further,

[0030] The length of the pushing cylinder is greater than or equal to the length of the discharging cylinder.

[0031] The concept and principle of the present application are as follows:

[0032] The feeding machine hydraulic system of the present application comprises a motor, a hydraulic pump, an oil tank, a control valve group and a hydraulic oil circuit; the control valve group comprises a first sensor, a second sensor, an electrical control box and an electromagnetic reversing valve; the two sensors convert the position information of the piston rod reaching two ends into electrical signals and transmit the electrical signals to the electrical control box; the electromagnetic reversing valve is connected with the electrical control box and separates the two oil circuits into a main oil circuit, an oil return circuit and two working oil circuits; after the electrical control box receives the position information of the piston rod, the electromagnetic reversing valve controls the oil flow direction of the hydraulic oil circuit by switching the connection ports of the two working oil circuits, so that the piston rod reciprocates to extrude the raw materials in the discharging cylinder to the work station and perform the feeding work.

[0033] The present application has the following advantages:

[0034] 1. The present application has reasonable matching of various hydraulic components, scientific design and stable operation, and the effect of prolonging the working time of the hydraulic system is remarkable, and good economic benefits are obtained.

[0035] 2. The present application is provided with an oil filter on the oil return circuit, and the oil filter is provided with a pollution transmitter, which reminds the operator to replace the filter element when the filter element is blocked by pollutants, and ensures the safe operation of the hydraulic oil circuit.

[0036] 3. The present application controls the electromagnetic reversing valve to switch the connection ports of the two working oil circuits through the electrical control box, so that the piston rod reciprocates. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 : Feeding machine hydraulic system schematic diagram.

[0038] In the figure: 1-motor; 2-hydraulic pump; 3-second check valve; 4-pressure gauge; 5-excess valve; 6-electromagnetic reversing valve; P-oil inlet of electromagnetic reversing valve 6; T-oil return of electromagnetic reversing valve 6; A-first working oil outlet of electromagnetic reversing valve 6; B-second working oil outlet of electromagnetic reversing valve 6; 7-bidirectional hydraulic lock; 8-check valve; 9-first stop valve; 10-second stop valve; 11-oil return filter with pollution transmitter; 12-air filter; 13-hydraulic oil tank; 14-liquid temperature and liquid level meter; 15-push cylinder; 16-first sensor; 17-second sensor; 18-discharge cylinder; 181-feeding inlet; 182-discharge outlet; 19-first check valve; 20-piston rod; 201-sensing ring on piston rod 20. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals are used throughout the drawings to refer to the same or like elements or elements having the same or similar functionality. The embodiments described below are exemplary and are intended to be illustrative of the present application and are not to be construed as limiting thereof.

[0040] As shown in the figure, a hydraulic system of a feeding machine is used to control the feeding machine to perform feeding work. Figure 1 As shown in the figure, a hydraulic system of a feeding machine is used to control the feeding machine to perform feeding work.

[0041] The feeding machine comprises a push cylinder 15, a discharge cylinder 18 and a hydraulic system, the push cylinder 15 is used to drive a piston rod 20, the discharge cylinder is used to feed, and the hydraulic system is used to control the piston rod 20 in the push cylinder 15.

[0042] The push cylinder 15 and the discharge cylinder 18 are coaxially arranged, and pistons are respectively arranged in the cylinders.

[0043] The pistons of the push cylinder 15 and the discharge cylinder 18 are coaxial and share a piston rod 20; one end of the piston rod 20 is connected to the piston of the push cylinder 15, so as to divide the push cylinder 15 into a first rodless cavity and a first rod cavity; the other end of the piston rod 20 is connected to the piston of the discharge cylinder 18, so as to divide the discharge cylinder 18 into a second rod cavity and a second rodless cavity.

[0044] In the embodiment, the length of the push cylinder 15 is greater than or equal to the length of the discharge cylinder 18, so as to ensure the movement space of the piston rod 20.

[0045] The second rodless cavity is provided with a feeding inlet 181 and a discharge outlet 182, and the direction of the discharge outlet is parallel to the piston rod 20; the feeding inlet 181 is provided with a first check valve 19, so as to ensure the one-way movement of the raw material; after the raw material enters the second rodless cavity through the feeding inlet 181, the raw material is extruded out through the discharge outlet 182 by the piston of the discharge cylinder 18. In the embodiment, the raw material is a viscous PE material.

[0046] Preferably, the feeding port 181 is perpendicular to the discharging port 182, preventing the feeding process and the discharging process from interfering with each other.

[0047] The hydraulic system comprises the motor 1, the hydraulic pump 2, the oil tank 13, the control valve group and the hydraulic oil circuit.

[0048] The motor 1 in the embodiment is a three-phase asynchronous motor.

[0049] The hydraulic pump 2 is connected with the oil tank 13, and is arranged on the hydraulic oil circuit. The motor 1 drives the hydraulic pump 2 to operate, and the hydraulic pump 2 draws oil from the oil tank 13 to supply the hydraulic oil circuit. The hydraulic oil circuit comprises two oil circuits, which are respectively connected with the first rodless cavity and the first rod cavity of the push cylinder 15, and the oil flow directions of the two oil circuits are switched to control the piston movement of the push cylinder 15.

[0050] The control valve group comprises the first sensor 16, the second sensor 17, the electrical control box and the electromagnetic reversing valve 6. The first sensor 16 and the second sensor 17 are arranged between the push cylinder 15 and the discharging cylinder 18, and are respectively arranged at two ends of the reciprocating movement route of the piston rod, so as to convert the position information of the piston rod 20 reaching the two ends into electrical signals and transmit the electrical signals to the electrical control box.

[0051] The first sensor 16 and the second sensor 17 in the embodiment are both inductive proximity switches. The piston rod 20 is provided with an inductive ring 201, which can cooperate with the two inductive proximity switches, so that when the piston rod 20 reaches the two ends of the reciprocating movement route, the inductive proximity switches generate electrical signals and transmit the electrical signals to the electrical control box.

[0052] The electromagnetic reversing valve 6 is connected with the electrical control box and is arranged on the two oil circuits at the same time, and the two oil circuits are divided into a main oil circuit, an oil return circuit, a first working oil circuit and a second working oil circuit. Correspondingly, the four oil circuit ports of the electromagnetic reversing valve 6 are: an oil inlet port P of the electromagnetic reversing valve 6, an oil return port T of the electromagnetic reversing valve 6, a first working oil port A of the electromagnetic reversing valve 6 and a second working oil port B of the electromagnetic reversing valve 6.

[0053] The first working oil circuit and the second working oil circuit are respectively connected with the first rodless cavity and the first rod cavity of the push cylinder 15. When the piston rod 20 reaches the two ends of the reciprocating movement route, the first sensor 16 or the second sensor 17 generates an electrical signal and transmits the electrical signal to the electrical control box. The electrical control box controls the electromagnetic reversing valve 6 to exchange the connection ports of the two working oil circuits, i.e. the connection ports of the electromagnetic reversing valve 6 and the two working oil circuits, controls the oil in the first working oil circuit and the second working oil circuit to flow reversely, and makes the piston rod 20 reciprocate. The stroke of the reciprocating movement of the piston rod 20 is less than or equal to the length of the discharging cylinder.

[0054] The hydraulic oil circuit is provided with a control valve group, which comprises a bidirectional hydraulic lock 7, a one-way throttle valve 8, a second one-way valve 3, an overflow valve 5, an oil return filter 11 and two stop valves.

[0055] The bidirectional hydraulic lock 7 is arranged between the first working oil circuit and the second working oil circuit, and the one-way throttle valve 8 is arranged between the first working oil circuit and the second working oil circuit; the combination of the bidirectional hydraulic lock 7 and the one-way throttle valve 8 enables the first working oil circuit and the second working oil circuit to be automatically locked and pressure-kept.

[0056] The hydraulic pump 2 and the second one-way valve 3 are both arranged on the main oil circuit, and the oil return filter 11 is arranged on the oil return circuit.

[0057] The overflow valve 5 is arranged on the main oil circuit and the oil return circuit, and is used for setting and adjusting the oil pressure of the hydraulic system.

[0058] The first working oil circuit and the second working oil circuit are each provided with a release oil circuit communicating with the oil tank 13, which is used for releasing the oil in the hydraulic oil circuit, and the two stop valves are arranged on the two release oil circuits respectively, which are a first stop valve 9 and a second stop valve 10; the two stop valves are closed when the hydraulic system is working, and when the hydraulic system fails or the push cylinder fails and needs to be repaired, the two stop valves are manually unscrewed to release the oil in the push cylinder 15 and the hydraulic oil circuit, so as to ensure the normal working process of the entire hydraulic system.

[0059] The oil tank is provided with a liquid temperature and liquid level meter 14, which is used for monitoring the oil temperature and the oil tank liquid level, preventing the oil temperature from being too high and the oil from being insufficient; the oil tank is provided with an air filter, which is used for purifying the air sucked by the oil tank, reducing the pollution of the oil, adjusting the air pressure in the oil tank and prolonging the stable working time of the hydraulic system.

[0060] The main oil circuit is provided with a pressure gauge 4, which is used for monitoring the working oil pressure of the main oil circuit.

[0061] The oil return filter 11 is provided with a pollution transmitter, which is used for alarming when the filter is blocked by pollutants, reminding the operator to replace the filter element and ensuring the safe operation of the hydraulic oil circuit.

[0062] Taking the plasticizing PE material feeding process as an example, the working principle of the hydraulic system of the feeding machine is as follows:

[0063] 1. Start the motor 1, and the motor 1 drives the hydraulic pump 2 to rotate to pump oil from the oil tank 13 into the main oil circuit; the working oil pressure of the hydraulic system is set through the overflow valve 5;

[0064] 2. In the initial state, the oil enters the second working oil circuit through the P-B port of the bidirectional hydraulic lock 7, and then enters the first rod cavity of the push cylinder 15, so as to drive the piston rod 20 to retreat together with the piston in the discharge cylinder 18;

[0065] Then the piston in the discharge cylinder 18 lets out the feeding port 181, so that the plasticized PE material enters the second rodless cavity of the discharge cylinder 18 through the feeding port 181; at the same time, the oil in the first rodless cavity of the push cylinder 15 is extruded by the piston and enters the oil return line through the A-T port of the electromagnetic reversing valve 6 from the first working oil line, and is recovered into the oil tank 13;

[0066] 3. When the piston rod 20 retreats until the second rodless cavity of the discharge cylinder 18 is filled with the plasticized PE material, at this time the inductive ring 201 on the piston rod 20 also retreats to the position of the first sensor 16, the first sensor 16 generates an electrical signal and transmits to the electrical control box, the electrical control box controls the electromagnetic reversing valve 6 to reverse; the oil enters the first working oil line through the P-A port of the electromagnetic reversing valve 6, and enters the first rodless cavity of the push cylinder 15, drives the piston rod 20 to advance;

[0067] Therefore, the piston in the discharge cylinder 18 advances, and the plasticized PE material in the discharge cylinder 18 is extruded to the work station through the discharge port 182 to perform the feeding work; at the same time, the oil in the first rodless cavity of the push cylinder is extruded by the piston and enters the oil return line through the B-T port of the electromagnetic reversing valve 6 from the first working oil line, and is recovered into the oil tank 13;

[0068] 4. When the inductive ring 201 on the piston rod 20 advances to the position of the second sensor 17, the second sensor 17 generates an electrical signal and transmits to the electrical control box, the electrical control box controls the electromagnetic reversing valve 6 to reverse, the oil enters the second working oil line through the P-B port of the electromagnetic reversing valve 6, and then enters the first rodless cavity of the push cylinder 15, drives the piston rod 20 to retreat together with the piston in the discharge cylinder 18, and restores to the initial state;

[0069] Then the piston in the discharge cylinder 18 lets out the feeding port 181, so that the plasticized PE material enters the second rodless cavity of the discharge cylinder 18 through the feeding port 181; at the same time, the oil in the first rodless cavity of the push cylinder 15 is extruded by the piston and enters the oil return line through the A-T port of the electromagnetic reversing valve 6 from the first working oil line, and is recovered into the oil tank 13;

[0070] The feeding machine hydraulic system reciprocates through the above process, the first one-way valve 19 arranged at the feeding port 181 is in an open state when the discharge cylinder 18 feeds, and is in a closed state when the discharge cylinder 18 discharges, so as to ensure the normal feeding and discharging work.

[0071] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application.

Claims

1. A hydraulic system for a feeding machine, The feeding machine includes a push cylinder, a discharge cylinder, and a hydraulic system; The push cylinder and the discharge cylinder are coaxially arranged, and each cylinder is equipped with a piston. The pistons of the push cylinder and the discharge cylinder are coaxial and share a common piston rod; one end of the piston rod is connected to the piston of the push cylinder, dividing the push cylinder into a first rodless chamber and a first rod chamber; the other end of the piston rod is connected to the piston of the discharge cylinder, dividing the discharge cylinder into a second rod chamber and a second rodless chamber. The second rodless chamber is provided with an inlet and an outlet, with the outlet direction parallel to the piston rod; the inlet is provided with a first one-way valve, after the raw material enters the second rodless chamber through the inlet, it is squeezed out by the piston through the outlet; Its features are: The hydraulic system includes a motor, a hydraulic pump, an oil tank, a control valve assembly, and hydraulic oil circuits; The hydraulic pump is connected to the oil tank and is installed in the hydraulic oil circuit. The motor drives the hydraulic pump to run and draw oil from the oil tank to supply oil to the hydraulic oil circuit. The hydraulic oil circuit includes two oil circuits, which are respectively connected to the first rodless chamber and the first rod chamber of the push cylinder. The control valve assembly includes a first sensor, a second sensor, an electrical control box, and a solenoid directional valve; The first and second sensors are respectively located at both ends of the piston rod's reciprocating motion path and connected to the electrical control box, between the push cylinder and the discharge cylinder. The two sensors convert the position information of the piston rod at both ends into electrical signals and transmit them to the electrical control box. After receiving the position information of the piston rod, the electrical control box controls the flow direction of the hydraulic oil circuit to make the piston rod reciprocate. The stroke of the piston rod's reciprocating motion is less than or equal to the length of the discharge cylinder. The electromagnetic reversing valve is connected to the electrical control box and is installed on two oil lines, which are divided into a main oil line, a return oil line, a first working oil line, and a second working oil line. When the piston rod reaches both ends of the reciprocating motion path, the first sensor or the second sensor generates an electrical signal and transmits it to the electrical control box. The electrical control box controls the electromagnetic reversing valve to switch the connection ports of the two working oil lines, so that the oil in the first working oil line and the second working oil line flows in opposite directions.

2. The hydraulic system for a feeding machine according to claim 1, characterized in that: Both the first and second sensors are inductive proximity switches; the piston rod is equipped with an induction coil, which can cooperate with the two inductive proximity switches so that when the piston rod reaches the two ends of the reciprocating motion path, the inductive proximity switches generate electrical signals.

3. The hydraulic system for a feeding machine according to claim 1, characterized in that: The control valve group also includes a two-way hydraulic lock, a one-way throttle valve, a second one-way valve, a relief valve, a return oil filter, and two shut-off valves; The bidirectional hydraulic lock is located between the first working oil circuit and the second working oil circuit; the one-way throttle valve is located between the first working oil circuit and the second working oil circuit. The hydraulic pump and the second check valve are both located on the main oil line, and the return oil filter is located on the return oil line. The overflow valve is installed on the main oil circuit and the return oil circuit; Each of the first and second working oil circuits is provided with a release oil circuit that connects to the oil tank, and two shut-off valves are respectively installed on the two release oil circuits.

4. The hydraulic system for a feeding machine according to claim 3, characterized in that: The oil tank is equipped with a liquid temperature and level gauge and an air filter; A pressure gauge is installed on the main oil line; The return oil filter is equipped with a contamination indicator.

5. The hydraulic system for a feeding machine according to claim 1, characterized in that: The length of the push cylinder is greater than or equal to the length of the discharge cylinder.

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