Hydraulic system of HTM4228 planer type milling machine

Abstract

The utility model relates to an HTM4228 planer type milling machine hydraulic system which comprises an oil tank, a variable oil pump, an overflow valve, a pressure reducing valve and an execution oil cylinder assembly which are sequentially connected, the variable oil pump is connected with a motor, the rated power of the motor is 1.5 KW, and the rated rotating speed of the motor is 960 r / min; the pressure reducing valve is connected with the execution oil cylinder assembly through an oil supply pipe, and the oil supply pipe is connected with an energy storage device with an oil storage cavity through a stop valve. According to the utility model, the power of the motor is reduced to 1.5 KW from the original 5.5 KW, the rotating speed is reduced to 960 r / min from the original 1460 r / min, the energy consumption of a machine tool is reduced, and the heat yield of a variable oil pump is reduced. Besides, the energy storage device is additionally arranged, when the oil amount needed by the machine tool is small, a proper amount of hydraulic oil is conveyed into the energy storage device, when the oil amount needed by the machine tool is large and large-flow oil supply is needed, the stop valve is opened, the hydraulic oil in the energy storage device enters the execution oil cylinder assembly, large-flow hydraulic oil is provided for the execution oil cylinder assembly, and the working requirement of the machine tool is met.

Description

Technical Field

[0001] The utility model belongs to the field of hydraulic systems, in particular to a hydraulic system of an HTM4228 gantry milling machine. Background Art

[0002] The HTM4228 gantry milling machine is a common machine tool. The original hydraulic system of this machine tool has a serious problem of hydraulic oil heating. For example, after one day of operation in winter, the oil temperature can reach as high as 74.6°C. Excessive oil temperature causes the following problems:

[0003] 1. The main oil pump is easy to break and needs to be shut down for maintenance and replacement (the main oil pump model is V38A2RX-95, its motor rated power is 5.5KW, rated speed is 1460r / min, and the purchase price of the oil pump is 3200 yuan / unit);

[0004] 2. The pressure control valve is not working properly and needs regular maintenance;

[0005] 3. The hydraulic oil turns black and deteriorates, and needs to be replaced frequently (180 kg of hydraulic oil should be replaced at most every 6 months);

[0006] 4. The oil suction filter is clogged and needs to be shut down for repair and replacement. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a hydraulic system of an HTM4228 gantry milling machine, which is reformed on the basis of the original hydraulic system and reduces the oil temperature of the hydraulic oil without affecting the working performance of the machine tool.

[0008] In order to solve the above problems, the technical solution adopted by the utility model is as follows: the hydraulic system of the HTM4228 gantry milling machine includes an oil tank, a variable oil pump, a relief valve, a pressure reducing valve and an actuator cylinder assembly connected in sequence, wherein the variable oil pump is connected to a motor,

[0009] The rated power of the motor is 1.5KW and the rated speed is 960r / min;

[0010] The pressure reducing valve is connected to the actuator cylinder assembly through an oil supply pipe, and the oil supply pipe is connected to an accumulator with an oil storage cavity through a stop valve.

[0011] Furthermore, the execution cylinder assembly includes a knife cylinder, a first balancing cylinder and a second balancing cylinder connected in parallel.

[0012] Furthermore, the variable oil pump is a V15A3RX-95 model plunger pump.

[0013] Furthermore, the oil supply pipe is connected to a pressure gauge.

[0014] Furthermore, the energy storage device is an airbag.

[0015] Furthermore, the maximum volume of the oil storage chamber of the energy accumulator is 16L.

[0016] Furthermore, the working pressure of the energy storage device is 10 MPa.

[0017] The beneficial effects of the utility model are:

[0018] The HTM4228 gantry milling machine requires a high oil flow rate for a small portion of its operation. To meet this requirement, the factory-configured main oil pump motor uses a high-power motor to ensure sufficient oil flow. However, during most operating hours, the required oil flow is low, causing the main oil pump to perform a lot of useless work, resulting in high energy consumption, heat generation, and increased oil temperature.

[0019] The utility model reconfigures the motor of the variable oil pump, reducing the motor power from the original 5.5KW to 1.5KW and the speed from the original 1460r / min to 960r / min, thereby reducing the energy consumption of the machine tool and the heat generation of the variable oil pump. In addition, by adding an accumulator, when the amount of oil required by the machine tool is small, the main oil pump (i.e., the variable oil pump) supplies oil to the actuator cylinder assembly and simultaneously delivers an appropriate amount of hydraulic oil to the accumulator, where the hydraulic oil has a high pressure. When the amount of oil required by the machine tool is large and a large flow of oil is required, the shut-off valve is opened, and the hydraulic oil in the accumulator enters the actuator cylinder assembly, providing a large flow of hydraulic oil to the actuator cylinder assembly to meet the working requirements of the machine tool.

[0020] After the original hydraulic system of the HTM4228 gantry milling machine was transformed according to the utility model, the oil temperature of the cylinder was 53.5°C after one day of operation in summer. Compared with before the transformation, the oil temperature was greatly reduced, the replacement frequency of the main oil pump, valves, hydraulic oil, etc. was reduced, and maintenance costs were saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the utility model;

[0022] Figure 2 It is a schematic diagram of another embodiment of the energy storage device of the utility model;

[0023] Figure numerals: 1—variable oil pump; 2—overflow valve; 3—pressure reducing valve; 4—motor; 5—stop valve; 6—energy accumulator; 7—knife cylinder; 8—first balancing cylinder; 9—second balancing cylinder; 10—pressure gauge; 11—oil tank; 12—oil supply pipe. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] The hydraulic system of the HTM4228 gantry milling machine of this utility model is as follows: Figure 1 As shown, it includes an oil tank 11, a variable oil pump 1, a relief valve 2, a pressure reducing valve 3 and an actuator cylinder assembly connected in sequence, and the variable oil pump 1 is connected to a motor 4.

[0026] The rated power of the motor 4 is 1.5 kW and the rated speed is 960 rpm. The pressure reducing valve 3 is connected to the actuator cylinder assembly via an oil supply pipe 12 , and the oil supply pipe 12 is connected to an accumulator 6 having an oil storage chamber via a stop valve 5 .

[0027] The oil tank 11 is used to store hydraulic oil. The variable oil pump 1 is the main oil pump of the hydraulic system, and the motor 4 is the power source of the variable oil pump 1. The overflow valve 2 and the pressure reducing valve 3 are used to control the flow and oil pressure of the hydraulic oil. The execution cylinder assembly is used to drive the movement of the components of the HTM4228 gantry milling machine to complete the processing. The execution cylinder assembly specifically includes a cutting cylinder 7, a first balancing cylinder 8 and a second balancing cylinder 9 connected in parallel. The oil tank 11, the overflow valve 2, the pressure reducing valve 3 and the execution cylinder assembly can adopt the existing technology, among which the cutting cylinder 7 is mainly used to clamp and release the tool, and the first balancing cylinder 8 and the second balancing cylinder 9 are used to ensure the upper and lower balance of the gantry milling cutter head (i.e., the Z axis) to prevent the tool head from moving up and down due to unstable oil pressure during the processing.

[0028] The HTM4228 gantry milling machine requires a high oil flow rate for a small portion of its operation. To meet this demand, the original hydraulic system of the HTM4228 gantry milling machine features a motor with a rated power of 5.5 kW and a rated speed of 1460 rpm, ensuring a high oil flow rate. However, during most operating hours, the required oil flow rate is low, causing variable oil pump 1 to perform a lot of useless work. This results in high energy consumption, low efficiency, and high heat generation, which increases oil temperature, easily damages various components, and increases maintenance costs.

[0029] In the present invention, the motor 4 of the variable oil pump 1 is reconfigured, and the power of the motor 4 is reduced from the original 5.5KW to 1.5KW, and the speed is reduced from the original 1460r / min to 960r / min. After the power is reduced, the energy consumption of the machine tool is reduced, useless work is avoided when the oil flow rate is small, and the heat generation of the variable oil pump 1 is reduced. In addition, in order to meet the demand for large-flow oil supply during a small amount of working time, an accumulator 6 is added. The accumulator 6 is provided with an oil storage chamber with a variable volume and automatic oil discharge. When the amount of oil required by the actuator cylinder assembly is small, the variable oil pump 1 supplies oil to the actuator cylinder assembly. At the same time, the hydraulic oil output by the variable oil pump 1 to the oil supply pipe 12 partially enters the oil storage chamber of the accumulator 6. When the oil pressure in the oil storage chamber reaches the set value, the stop valve 5 is closed, and the hydraulic oil no longer enters the accumulator 6. When the machine tool requires a large amount of oil and a large flow of oil supply is required, the stop valve 5 is opened, and the hydraulic oil in the accumulator 6 can enter the actuator cylinder assembly through the oil supply pipe 12, providing a large flow of hydraulic oil to the actuator cylinder assembly to meet the working requirements of the machine tool.

[0030] To accommodate the change in motor 4, the variable oil pump 1 in this utility model is a V15A3RX-95 plunger pump. The original main oil pump, model V38A2RX-95, had a displacement of 38 liters per minute. After replacing it with the new variable oil pump 1, the displacement has been reduced to 15 liters per minute, matching the power and speed of motor 4. This reconfiguration of the variable oil pump 1 and motor 4 reduces their power and heat generation.

[0031] In order to facilitate monitoring of the oil pressure of the oil supply pipe 12 , a pressure gauge 10 is connected to the oil supply pipe 12 .

[0032] In the present invention, the energy accumulator 6 can be an airbag. The airbag itself has a certain elasticity. After the hydraulic oil enters the interior of the airbag, the airbag will expand and deform to generate elastic force, the volume of the oil storage chamber will increase, and at the same time, the oil pressure of the hydraulic oil will continue to increase. When the hydraulic oil pressure in the airbag reaches the set value, or the volume of the oil storage chamber expands to the set value, the oil supply to the oil storage chamber is stopped. When it is necessary to provide a large flow of hydraulic oil to the actuator cylinder assembly, the stop valve 5 is opened, and the hydraulic oil in the airbag enters the oil supply pipe 12 under the action of the elastic force of the airbag, and then enters the actuator cylinder assembly. According to the oil supply needs, the maximum volume of the oil storage chamber of the energy accumulator 6 of the present invention is 16L, and the working pressure of the energy accumulator 6 is 10MPa, that is, when the volume of the oil storage chamber of the airbag reaches 16L and the internal oil pressure reaches 10MPa, the oil supply to the interior of the airbag is stopped.

[0033] In addition to using air bags, the energy storage device 6 can also be used as Figure 2 The piston structure shown includes a cylinder, with a piston disposed inside the cylinder. The piston and the cylinder slide and seal together, and the piston divides the inner cavity of the cylinder into an oil storage chamber and a pressure chamber. The shut-off valve 5 is connected to the oil storage chamber, and a spring is disposed in the pressure chamber. After the hydraulic oil enters the oil storage chamber, it pushes the piston to move, compressing the spring. The spring generates elastic force, and the hydraulic oil pressure in the oil storage chamber continuously increases. When the oil pressure in the oil storage chamber reaches 10MPa, the oil supply to the oil storage chamber is stopped, and the shut-off valve 5 is closed. When a large flow of hydraulic oil is required to be supplied to the actuator cylinder assembly, the shut-off valve 5 is opened, and the elastic force of the spring pushes the piston to move, pressing the hydraulic oil in the oil storage chamber out to the oil supply pipe 12.

[0034] The utility model can be modified on the basis of the original hydraulic system of the HTM4228 gantry milling machine. The modification cost is low. After the modification, the oil temperature of the cylinder can be greatly reduced to 53.5°C after one day of operation in summer. Compared with before the modification, the oil temperature is lower, the replacement frequency of the main oil pump, valves, hydraulic oil, etc. is reduced, and the maintenance cost is saved.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. The hydraulic system of an HTM4228 gantry milling machine comprises an oil tank (11), a variable oil pump (1), a relief valve (2), a pressure reducing valve (3) and an actuator oil cylinder assembly connected in sequence, wherein the variable oil pump (1) is connected to a motor (4), and is characterized in that: The rated power of the motor (4) is 1.5KW, and the rated speed is 960r / min; The pressure reducing valve (3) is connected to the actuator cylinder assembly via an oil supply pipe (12), and the oil supply pipe (12) is connected to an accumulator (6) having an oil storage chamber via a stop valve (5).

2. The hydraulic system of the HTM4228 gantry milling machine according to claim 1, characterized in that: The execution cylinder assembly comprises a knife-cutting cylinder (7), a first balancing cylinder (8) and a second balancing cylinder (9) connected in parallel.

3. The hydraulic system of the HTM4228 gantry milling machine according to claim 1, characterized in that: The variable oil pump (1) is a V15A3RX-95 model plunger pump.

4. The hydraulic system of the HTM4228 gantry milling machine according to claim 1, characterized in that: The oil supply pipe (12) is connected to a pressure gauge (10).

5. The hydraulic system of the HTM4228 gantry milling machine according to claim 1, characterized in that: The energy storage device (6) is an air bag.

6. The hydraulic system of the HTM4228 gantry milling machine according to claim 5, characterized in that: The maximum volume of the oil storage chamber of the energy accumulator (6) is 16L.

7. The hydraulic system of the HTM4228 gantry milling machine according to claim 5, characterized in that: The working pressure of the energy storage device (6) is 10 MPa.

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