A lubrication and cooling system for the bearings of a sand making machine

Abstract

The present invention discloses a lubrication and cooling system for a bearing of a sand making machine, which includes a lubrication system, a cooling system, a controller and an oil tank. Hydraulic oil and a first temperature sensor are provided in the oil tank. The oil tank is provided with a first inlet, a first outlet, a first inlet and a second outlet. The lubrication system includes a first motor pump set, and the first motor pump set is connected to the first outlet. The cooling system includes a plate heat exchanger, and a heat medium flow channel and a refrigerant flow channel are provided in the plate heat exchanger. One end of the heat medium flow channel is connected to the second outlet through a second motor pump set, and the other end of the heat medium flow channel is connected to the second inlet. One end of the refrigerant flow channel is connected to a condenser through a compressor, the condenser is connected to an expansion valve through a liquid storage tank, and the expansion valve is connected to the refrigerant flow channel. The first motor pump set, the second motor pump set and the compressor are all connected to the controller. The present invention has the advantages of small influence of ambient temperature on lubricating and dissipating heat of the bearing, and the bearing is not easily damaged.

Description

Technical Field

[0001] The present invention belongs to the field of cooling equipment for sand making machines, and particularly relates to a lubricating and cooling system for the bearings of a sand making machine. Background Art

[0002] The bearings of the sand making machine are arranged in the main body of the sand making machine. During actual use, a large amount of heat is generated, and it is easy to overheat and be damaged. The bearings rely on an air-cooled hydraulic system for heat dissipation. The air-cooled hydraulic system uses hydraulic oil as the heat dissipation medium. The hydraulic oil enters the main body of the machine from the oil inlet of the main body, lubricates and cools the bearings. The heated hydraulic oil is discharged from the oil outlet of the main body and dissipates heat with the air flow. After cooling, it flows back into the main body of the machine continuously and circulates to lubricate and dissipate heat from the bearings. Since the heat dissipation speed of the hydraulic oil is related to the air temperature and is greatly affected by the ambient temperature, and the sand making machine will continuously heat up during the working process, causing large fluctuations in the ambient temperature. Seasonal changes will further increase the fluctuations in the ambient temperature, resulting in large fluctuations in the heat dissipation speed of the hydraulic oil, and the temperature of the hydraulic oil flowing back to the bearings is unstable and varies greatly. When the temperature of the hydraulic oil flowing back to the bearings is too low, the viscosity of the hydraulic oil is relatively large, and it cannot reach the ideal working temperature, and a good oil film cannot be formed on the bearings, resulting in easy wear and damage of the bearings; when the temperature of the hydraulic oil flowing back to the bearings is too high, it is difficult to quickly take away the heat of the bearings, resulting in easy overheating and damage of the bearings. Therefore, the existing air-cooled hydraulic system for lubricating and dissipating heat from the bearings has the defect of being greatly affected by the ambient temperature, and the bearings are easy to be damaged. Summary of the Invention

[0003] The purpose of the present invention is to provide a lubricating and cooling system for a sand making machine. The present invention has the advantage of being less affected by the ambient temperature when lubricating and dissipating heat from the bearings, and the bearings are not easy to be damaged.

[0004] The technical solution of the present invention: A lubricating and cooling system for the bearings of a sand making machine includes a lubricating system, a cooling system, a controller, and an oil tank. The oil tank is provided with hydraulic oil and a first temperature sensor, and the oil tank is provided with a first inlet, a first outlet, a second inlet, and a second outlet. The first inlet is used to connect to the oil outlet of the main body of the machine;

[0005] The lubricating system includes a first motor pump unit. The oil inlet end of the first motor pump unit is connected to the first outlet, and the oil outlet end of the first motor pump unit is used to connect to the oil inlet of the main body of the machine;

[0006] The cooling system includes a plate heat exchanger. The plate heat exchanger is provided with a heat medium flow channel and a refrigerant flow channel. One end of the heat medium flow channel is connected to the second outlet through a second motor pump unit, and the other end of the heat medium flow channel is connected to the second inlet; One end of the refrigerant flow channel is connected to the condenser through a compressor, the condenser is connected to the expansion valve through a liquid storage tank, and the expansion valve is connected to the other end of the refrigerant flow channel;

[0007] The first motor pump set, the second motor pump set and the compressor are all connected to the controller.

[0008] In the lubrication and cooling system of the aforementioned sand making machine bearing, the first motor pump set is connected to a flow regulator through a filter, the flow regulator is connected to the oil inlet of the main machine through a pressure regulator, and the flow regulator is connected to the controller.

[0009] In the lubrication and cooling system of the aforementioned sand making machine bearing, the liquid storage tank is connected to the expansion valve through a desiccant tank.

[0010] In the lubrication and cooling system of the aforementioned sand making machine bearing, one end of the refrigerant flow channel is connected to the compressor through a first pipeline, and a temperature sensing package connected to the outer side wall of the first pipeline is provided on the expansion valve.

[0011] In the lubrication and cooling system of the aforementioned sand making machine bearing, the compressor is connected to the condenser through a second pipeline, and a pressure gauge is provided on the second pipeline.

[0012] In the lubrication and cooling system of the aforementioned sand making machine bearing, the first inlet is connected to the oil outlet of the main machine through an oil return filter, and a second temperature sensor connected to the controller is provided at the oil outlet of the main machine.

[0013] Compared with the prior art, the present invention can control the flow rate of the hydraulic oil entering the main machine. When the temperature of the hydraulic oil in the fuel tank is relatively low, the hydraulic oil passes through the main machine at a slower speed, reducing the heat loss of the main machine, enabling the hydraulic oil entering the main machine to quickly rise to the ideal working temperature, and forming a good oil film on the bearing, so that the bearing is not easily worn and damaged. When the temperature of the hydraulic oil in the fuel tank is relatively high, the hydraulic oil can be passed into the cooling system for heat dissipation. When the refrigerant dissipates heat in the condenser, it becomes a high-temperature and high-pressure liquid under the action of the compressor, and the temperature difference from the ambient temperature is extremely large, so it is less affected by the ambient temperature, and can quickly dissipate heat even when the ambient temperature is relatively high; when the refrigerant exchanges heat with the hydraulic oil in the plate heat exchanger, the temperature is extremely low, and the temperature difference from the hydraulic oil is large, which can ensure that the hydraulic oil quickly cools down, and in turn ensure that the heat of the bearing can be quickly taken away when flowing through the bearing, so that the bearing is not easily overheated and damaged.

[0014] Therefore, the present invention has the advantage of being less affected by the ambient temperature for lubricating and dissipating heat of the bearing, and the bearing is not easily damaged. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present invention.

[0016] The reference signs in the drawings are as follows: 1 - lubrication system, 2 - cooling system, 3 - controller, 4 - oil tank, 6 - main machine, 101 - first motor pump unit, 102 - filter, 103 - flow regulator, 104 - pressure regulator, 105 - return oil filter, 106 - second temperature sensor, 201 - plate heat exchanger, 202 - second motor pump unit, 203 - compressor, 204 - condenser, 205 - liquid storage tank, 206 - expansion valve, 207 - desiccant tank, 208 - first pipeline, 209 - second pipeline, 210 - pressure gauge, 211 - temperature sensing bulb, 401 - first temperature sensor, 402 - first inlet, 403 - first outlet, 404 - second inlet, 405 - second outlet, 601 - oil outlet, 602 - oil inlet. Detailed implementation mode

[0017] The present invention will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0018] Embodiment. A lubrication and cooling system for the bearings of a sand making machine, as Figure 1 shown, includes a lubrication system 1, a cooling system 2, a controller 3 and an oil tank 4. The oil tank 4 is provided with hydraulic oil and a first temperature sensor 401. The oil tank 4 is provided with a first inlet 402, a first outlet 403, a second inlet 404 and a second outlet 405. The first inlet 402 is used to connect to the oil outlet 601 of the main machine 6;

[0019] The lubrication system 1 includes a first motor pump unit 101. The inlet end of the first motor pump unit 101 is connected to the first outlet 403, and the outlet end of the first motor pump unit 101 is used to connect to the oil inlet 602 of the main machine 6;

[0020] The cooling system 2 includes a plate heat exchanger 201. The plate heat exchanger 201 is provided with a heat medium flow channel and a refrigerant flow channel. One end of the heat medium flow channel is connected to the second outlet 405 through a second motor pump unit 202, and the other end of the heat medium flow channel is connected to the second inlet 404; One end of the refrigerant flow channel is connected to the condenser 204 through a compressor 203. The condenser 204 is connected to the expansion valve 206 through a liquid storage tank 205. The liquid storage tank 205 is provided with a high-pressure refrigerant in a liquid state (such as freon), and the expansion valve 206 is connected to the other end of the refrigerant flow channel;

[0021] The first motor pump unit 101, the second motor pump unit 202 and the compressor 203 are all connected to the controller 3.

[0022] The first motor pump unit 101 is connected to a flow regulator 103 through a filter 102. The flow regulator 103 is connected to the oil inlet of the main machine 6 through a pressure regulator 104. The flow regulator 103 is connected to the controller 3.

[0023] The liquid storage tank 205 is connected to the expansion valve 206 through the desiccant tank 207. The desiccant tank 207, also known as a liquid receiver dryer in the industry, is a commercially available product mainly used to absorb water vapor in the pipeline.

[0024] One end of the refrigerant flow path is connected to the compressor 203 through the first pipeline 208. A temperature sensing bulb 211 is provided on the expansion valve 206 and is connected to the outer side wall of the first pipeline 208. The expansion valve 206 is prior art, and those skilled in the art can freely choose to use it. The temperature sensing bulb 211 is part of the expansion valve 206. The expansion valve 206 detects the temperature of the refrigerant flowing out of the plate heat exchanger 201 through the temperature sensing bulb 211 and automatically adjusts the opening degree accordingly.

[0025] The compressor 203 is connected to the condenser 204 through the second pipeline 209, and a pressure gauge 210 is provided on the second pipeline 209.

[0026] The first inlet 402 is connected to the oil outlet 601 of the main machine 6 through the oil return filter 105, and a second temperature sensor 106 connected to the controller 3 is provided at the oil outlet 601 of the main machine 6.

[0027] Working principle: When the sand making machine starts, the controller 3 is turned on. The controller 3 outputs a first signal to the first motor pump group 101. The first motor pump group 101 operates to extract the hydraulic oil in the oil tank 4. The hydraulic oil sequentially passes through the first motor pump group 101, the filter 102, the flow regulator 103, the pressure regulator 104, and the oil inlet 602 and enters the main machine 6. It flows through the bearing to lubricate and dissipate heat from the bearing. The hydraulic oil heats up. The heated hydraulic oil sequentially passes through the oil outlet 601, the oil return filter 105, and the first inlet 402 and returns to the oil tank 4. The temperature of the hydraulic oil in the oil tank 4 will gradually increase.

[0028] The first temperature sensor 401 generates a second signal based on the temperature of the hydraulic oil in the fuel tank 4 and transmits it to the controller 3. The controller 3 determines the temperature of the hydraulic oil in the fuel tank 4 according to the second signal. The second temperature sensor 106 generates a third signal based on the temperature of the hydraulic oil at the oil outlet 601 of the main engine and transmits it to the controller 3. The controller 3 determines the temperature of the hydraulic oil at the oil outlet 601 according to the third signal. When the controller 3 determines that the temperature of the hydraulic oil in the fuel tank 4 is less than 15 °C and the temperature difference between the hydraulic oil in the fuel tank 4 and the hydraulic oil at the oil outlet 601 is below 15 °C (at this time, the bearing is not overheated), the controller 3 outputs a fourth signal to the flow regulator 103. The flow regulator 103 reduces the opening degree, so that the hydraulic oil passes through the main engine 6 at a very slow speed (the lower the temperature of the hydraulic oil in the fuel tank 4, the slower the speed of the hydraulic oil passing through the main engine 6), so that the hydraulic oil entering the main engine 6 can be quickly heated to the normal working temperature, forming a good oil film to lubricate the bearing and ensuring that the bearing is not easily damaged. When the controller 3 determines that the temperature difference between the hydraulic oil in the fuel tank 4 and the hydraulic oil at the oil outlet 601 is above 15 °C, it is determined that the bearing is overheated. The controller 3 outputs a fifth signal to the flow regulator 103. The flow regulator 103 increases the opening degree, so that the hydraulic oil passes through the main engine 6 at a faster speed (the greater the temperature difference, the faster the speed of the hydraulic oil passing through the main engine 6), quickly taking away the heat of the bearing and preventing the bearing from being damaged due to overheating.

[0029] When the controller 3 determines that the temperature of the hydraulic oil in the fuel tank 4 reaches 40 °C or above, the controller respectively sends sixth and seventh signals to the second motor pump group 202 and the compressor 203. The second motor pump group 202 and the compressor 203 are started. The hydraulic oil in the fuel tank 4 sequentially passes through the second outlet 405 and the second motor pump group 202 and enters the plate heat exchanger 201 for heat exchange to cool down. The hydraulic oil with reduced temperature returns to the fuel tank 4 from the second inlet 404, and the temperature of the hydraulic oil in the fuel tank 4 decreases. Under the action of the compressor 203, the refrigerant in the liquid storage tank 205 enters the expansion valve 206 through the desiccant tank 207. The refrigerant vaporizes through the expansion valve, and the temperature drops sharply. It enters the plate heat exchanger 201 to exchange heat with the hydraulic oil and then warms up. Then it enters the compressor 203 through the first pipeline 208, becomes a high-temperature and high-pressure liquid through the compressor 203, and then enters the condenser 204 through the second pipeline 209 for heat dissipation, and then flows back to the liquid storage tank 205.

[0030] The lubrication and heat dissipation of the bearing in the present invention have the advantage of being less affected by the ambient temperature, and the bearing is not easily damaged.

Claims

1. A lubrication and cooling system for a bearing of a sand making machine, characterized in that: It includes a lubrication system (1), a cooling system (2), a controller (3) and an oil tank (4). The oil tank (4) is provided with hydraulic oil and a first temperature sensor (401). The oil tank (4) is provided with a first inlet (402), a first outlet (403), a second inlet (404) and a second outlet (405). The first inlet (402) is used to connect to the oil outlet (601) of the main engine (6); The lubrication system (1) includes a first motor pump set (101). The inlet end of the first motor pump set (101) is connected to the first outlet (403), and the outlet end of the first motor pump set (101) is used to connect to the oil inlet (602) of the main engine (6); The cooling system (2) includes a plate heat exchanger (201). The plate heat exchanger (201) is provided with a heat medium flow channel and a refrigerant flow channel. One end of the heat medium flow channel is connected to the second outlet (405) through a second motor pump set (202), and the other end of the heat medium flow channel is connected to the second inlet (404); One end of the refrigerant flow channel is connected to the condenser (204) through the compressor (203). The condenser (204) is connected to the expansion valve (206) through the liquid storage tank (205), and the expansion valve (206) is connected to the other end of the refrigerant flow channel; The first motor pump set (101), the second motor pump set (202) and the compressor (203) are all connected to the controller (3); The first motor pump set (101) is connected to the flow regulator (103) through a filter (102). The flow regulator (103) is connected to the oil inlet of the main engine (6) through a pressure regulator (104), and the flow regulator (103) is connected to the controller (3); The first inlet (402) is connected to the oil outlet (601) of the main engine (6) through an oil return filter (105). A second temperature sensor (106) connected to the controller (3) is provided at the oil outlet (601) of the main engine (6); When the temperature of the hydraulic oil in the oil tank (4) is less than 15°C and the temperature difference between the hydraulic oil in the oil tank (4) and the hydraulic oil at the oil outlet (601) is below 15°C, the flow regulator (103) reduces the opening degree, so that the hydraulic oil entering the main engine (6) can be quickly heated to the normal working temperature, forming a good oil film to lubricate the bearing and ensuring that the bearing is not easily damaged; When the temperature difference between the hydraulic oil in the oil tank (4) and the hydraulic oil at the oil outlet (601) is above 15°C, the flow regulator (103) increases the opening degree, so that the hydraulic oil can quickly take away the heat of the bearing and avoid damage to the bearing due to overheating.

2. The lubrication and cooling system for the bearing of the sand making machine according to claim 1, wherein: The liquid storage tank (205) is connected to the expansion valve (206) through a desiccant tank (207).

3. The lubrication and cooling system of the bearing of the sand making machine according to claim 1, characterized in that: One end of the refrigerant flow channel is connected to the compressor (203) through a first pipeline (208). A temperature sensing bulb (211) connected to the outer wall of the first pipeline (208) is provided on the expansion valve (206).

4. The lubrication and cooling system of the bearing of the sand making machine according to claim 1, wherein: The compressor (203) is connected to the condenser (204) through a second pipeline (209). A pressure gauge (210) is provided on the second pipeline (209).

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