A temperature control device and method for the hydraulic system of a grab dredger

Abstract

This invention provides a temperature control device for the hydraulic system of a grab dredger, including a hydraulic oil tank, a heat exchanger disposed inside the hydraulic oil tank, a water tank disposed outside the hydraulic oil tank for supplying refrigerant to the heat exchanger, and a cooling component disposed at the output end of the heat exchanger. The end of the cooling component away from the heat exchanger extends into the hydraulic pump compartment. The inner wall of the hydraulic oil tank is also provided with a buffer mechanism, which includes a fixed plate, a buffer rod disposed between the heat exchanger and the fixed plate for absorbing vibrations of the heat exchanger, and a heat dissipation component meshing with the buffer rod. The water tank contains a first water pump and a second water pump, with the output end of the first water pump connected to the inlet end of the heat exchanger. This invention can dissipate heat from the heat exchanger during operation to prevent the hydraulic oil temperature from becoming too high and affecting construction efficiency, while also absorbing vibrations generated during the operation of the heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of dredging technology, specifically to a temperature control device and method for the hydraulic system of a grab dredging vessel. Background Technology

[0002] There are many types of dredgers, which can be broadly classified into two categories based on their dredging methods: mechanical dredgers and suction dredgers. Mechanical dredging uses different types of buckets, including grab buckets, shovel buckets, and bucket wheel buckets. Grab bucket dredgers have a box-shaped hull with a relatively large width to prevent excessive tilting when the grab bucket is turned to dump mud. Currently, the hydraulic oil tanks for grab buckets are located inside the grab bucket's dome. The hydraulic oil is cooled by the dome being submerged in water during the grab bucket's descent to break the soil and dredge. However, because the dome cannot be submerged to cool the hydraulic oil during the grab bucket's descent, and the dredging time is too short to adequately cool the hydraulic oil, the hydraulic oil temperature becomes too high, triggering the shutdown protection system and causing work stoppages that affect effective construction time. Furthermore, normal construction is impossible in areas where the water depth is less than 8 meters (the dome cannot be completely submerged). Therefore, a temperature control device is needed to address the problem of excessively high temperatures in the grab bucket's hydraulic system. Summary of the Invention

[0003] This invention provides a temperature control device and method for the hydraulic system of a grab bucket dredger that can dissipate heat from the heat exchanger to avoid excessively high hydraulic oil temperature affecting construction efficiency, and can absorb vibrations generated during the operation of the heat exchanger.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A temperature control device for the hydraulic system of a grab dredger includes a hydraulic oil tank, a heat exchanger disposed inside the hydraulic oil tank, a water tank disposed outside the hydraulic oil tank for supplying refrigerant to the heat exchanger, and a cooling component disposed at the output end of the heat exchanger. The end of the cooling component away from the heat exchanger extends into the hydraulic pump chamber. The inner wall of the hydraulic oil tank is also provided with a buffer mechanism, which includes a fixed plate, a buffer rod disposed between the heat exchanger and the fixed plate for absorbing vibration of the heat exchanger, and a heat dissipation component that meshes with the buffer rod.

[0006] Preferably, the water tank is equipped with a first water pump and a second water pump. The output end of the first water pump is connected to the liquid inlet of the heat exchanger, and the input end of the second water pump is connected to a suction hose. The end of the suction hose is equipped with a suction port with a float and a mesh filter, and the suction hose is also equipped with a shut-off check valve.

[0007] Preferably, the water tank is also equipped with a liquid level float switch.

[0008] Preferably, the cooling assembly includes a water spray pipe disposed at the output end of the heat exchanger and extending above the hydraulic pump chamber, and a water spray nozzle disposed on the outer wall of the water spray pipe.

[0009] Preferably, the buffer rod includes a fixed rod fixed to the bottom wall of the hydraulic oil tank along the length of the heat exchanger, a transmission rod parallel to the fixed rod and elastically disposed above the fixed rod by a first spring damper, and a buffer rod parallel to the transmission rod and movably disposed above the transmission rod by a transition rod, wherein the side of the buffer rod away from the transmission rod is connected to the fixed plate by a second spring damper.

[0010] Preferably, at least two parallel hinged rods are rotatably connected to both ends of the fixed rod, and the end of the hinged rod away from the fixed rod is rotatably connected to the transmission rod.

[0011] Preferably, the buffer rod further includes a buffer block slidably connected to the fixed plate, a connecting rod with one end hinged to the buffer block and the other end hinged to the side wall of the heat exchanger, and a connecting folding rod fixed to the top of the buffer block with its end away from the buffer block and fixedly connected to the buffer rod.

[0012] Preferably, the fixing plate has a groove that matches the buffer block, and a buffer spring is connected between the buffer block and the inner wall of the groove.

[0013] Preferably, the heat dissipation assembly includes a rotating shaft rotatably mounted on the bottom wall of the hydraulic oil tank, a driven gear fixedly mounted on the rotating shaft, a driving rack fixedly mounted on the side wall of the buffer block and meshing with the driven gear, and heat dissipation fan blades fixedly mounted on the side wall of the rotating shaft.

[0014] A method for temperature control of the hydraulic system of a grab dredger includes the following steps:

[0015] S10: When the water depth in the dredging area can submerge the grab bucket's turtle cover, seawater is poured into the water tank to fill it when the grab bucket enters the water to dredge the mud. After the grab bucket emerges from the water, the seawater in the water tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank.

[0016] S20: When the water depth in the dredging area is not deep enough to submerge the grab bucket's turtle cover, the water tank draws water from the water at the bucket teeth position into the water tank, and after the grab bucket emerges from the water, the seawater in the water tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank.

[0017] S30: Water that has undergone heat transfer with hydraulic oil via a heat exchanger is transported to the hydraulic pump chamber via a cooling component to cool the hydraulic pump chamber.

[0018] As can be seen from the above technical solutions, the present invention has the following beneficial effects:

[0019] 1. In this invention, when the water depth in the dredging area is sufficient to submerge the grab bucket's turtle-shaped cover, seawater is pumped into the water tank to fill it during dredging. After the grab bucket emerges from the water, the seawater in the tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank. Conversely, when the water depth in the dredging area is insufficient to submerge the grab bucket's turtle-shaped cover, water is drawn into the water tank from the bucket teeth. After the grab bucket emerges from the water, the seawater in the tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank. The water, after heat transfer between the heat exchanger and the hydraulic oil, is then transported to the hydraulic pump chamber via a cooling component to cool the hydraulic pump chamber. Furthermore, to mitigate the impact of grab bucket dredging vibration on the heat exchanger, the four corners of the heat exchanger are suspended and fixed to the four walls of the hydraulic oil tank by springs. Vibrations generated by the heat exchanger during operation are absorbed by buffer rods, and the movement of these buffer rods drives the heat dissipation component to further dissipate heat from the heat exchanger, preventing the hydraulic oil temperature from becoming too high and affecting construction efficiency.

[0020] 2. In this invention, by setting up a buffer mechanism, the presence of the buffer rod can absorb the vibration generated by the grab boat on the heat exchanger during operation, that is, it can absorb the vertical and horizontal vibration of the heat exchanger at the same time, so as to avoid the external force from having an adverse effect on the operation of the heat exchanger. Attached Figure Description

[0021] Figure 1 The schematic diagram of the temperature control device provided by the present invention;

[0022] Figure 2 This is a front view of the water tank;

[0023] Figure 3 This is a side view of the water tank;

[0024] Figure 4 This is a top view of the water tank;

[0025] Figure 5 This is a schematic diagram showing the connection between the heat exchanger and the buffer mechanism.

[0026] Figure 6 for Figure 5 A schematic diagram of a single-sided heat exchanger.

[0027] Figure 7 This is a schematic diagram of the buffer mechanism;

[0028] Figure 8 for Figure 7 A structural diagram from another perspective;

[0029] Figure 9 for Figure 8 A magnified view of part A in the middle.

[0030] In the diagram: 10, Hydraulic oil tank; 20, Heat exchanger; 30, Water tank; 310, First water pump; 320, Second water pump; 330, Suction hose; 340, Suction inlet; 350, Stop check valve; 360, Liquid level float switch; 40, Cooling assembly; 410, Spray pipe; 420, Spray nozzle; 510, Fixing plate; 511, Slide groove; 512, Buffer spring; 521, Fixing rod; 522, First spring damper; 523, Transmission rod; 524, Adapter rod; 525, Buffer rod; 526, Second spring damper; 527, Hinge rod; 528, Buffer block; 529, Connecting rod; 5210, Connecting folding rod; 531, Rotating shaft; 532, Driven gear; 533, Driving rack; 534, Cooling fan blade. Detailed Implementation

[0031] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] To achieve the above objectives, embodiments of the present invention provide the following technical solutions:

[0033] Reference Figure 1 , Figure 5A temperature control device for the hydraulic system of a grab dredger includes a hydraulic oil tank 10, a heat exchanger 20, a water tank 30, and a cooling component 40. Specifically, in this embodiment, there are two heat exchangers, with the heat exchanger 20 located inside the hydraulic oil tank and the water tank 30 located outside, used to supply refrigerant to the heat exchangers to cool the hydraulic oil in the tank. The cooling component 40 is located at the output end of the heat exchanger, with one end extending away from the heat exchanger into the hydraulic pump compartment. Furthermore, a buffer mechanism is provided on the inner wall of the hydraulic oil tank. The buffer mechanism includes a fixed plate 510, a buffer rod, and a heat dissipation component. The buffer rod is located between the heat exchanger and the fixed plate to absorb vibrations from the heat exchanger. The heat dissipation component is meshed and driven by the buffer rod, and can rotate inside the hydraulic oil tank under the drive of the buffer rod to further dissipate heat from the hydraulic oil. During use, when the water depth in the dredging area is... When the water depth is sufficient to submerge the grab bucket's turtle-shaped cover, seawater is pumped into the water tank to fill it during dredging. After the grab bucket emerges from the water, the seawater in the tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank. When the water depth in the dredging area is insufficient to submerge the grab bucket's turtle-shaped cover, water is drawn into the water tank from the bucket teeth. After the grab bucket emerges from the water, the seawater in the tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank. The water, after heat transfer between the heat exchanger and the hydraulic oil, is then transported to the hydraulic pump chamber via a cooling component to cool the hydraulic pump chamber. In addition, to mitigate the impact of grab bucket dredging vibration on the heat exchanger, the four corners of the heat exchanger are suspended and fixed to the four walls of the hydraulic oil tank by springs. The vibration generated by the heat exchanger during operation is absorbed by a buffer mechanism, and the movement of the buffer rod drives the heat dissipation component to further dissipate heat from the heat exchanger, preventing the hydraulic oil temperature from becoming too high and affecting construction efficiency.

[0034] In this way, by using springs at the four corners of the heat exchanger and buffer mechanisms on the side walls of the heat exchanger to absorb vibrations in multiple directions, effective vibration absorption can be achieved.

[0035] It should be noted that the water tank is located on one or both sides of the grab bucket's turtle cover along its length, and the volume of the external water tank is equal to the time the grab bucket is above the water surface during construction multiplied by the flow rate of the external water pump per unit time.

[0036] Refer to Figure 2 , Figure 3 , Figure 4As a preferred technical solution in this embodiment, the water tank 30 is equipped with a first water pump 310 and a second water pump 320. Further, the output end of the first water pump is connected to the liquid inlet end of the heat exchanger, and the input end of the second water pump is connected to a suction hose 330. The end of the suction hose is equipped with a suction port 340 with a float and a filter screen. The suction hose is also equipped with a shut-off check valve 350. In this embodiment, by setting two water pumps in the water tank 30, the first water pump 310 is responsible for pumping seawater from the water tank into the heat exchanger, while the second water pump 320 draws seawater from the water at the bucket tooth position into the water tank through a rigid hose when the water depth in the dredging area is shallow and cannot submerge the grab bucket's turtle shell. It should be noted that the first and second water pumps are automatically controlled. When working in an area with sufficiently deep water, the second water pump can be manually shut off.

[0037] Furthermore, the water tank 30 is also equipped with a liquid level float switch 360. This liquid level float switch is a simple and easy-to-use liquid level control component that can be used for liquid level detection, on-site indication signal transmission, and liquid level alarm in various small and medium-sized atmospheric and pressurized liquid storage tanks, thereby facilitating the monitoring of the liquid level in the water tank 30.

[0038] As a preferred technical solution in this embodiment, the cooling component 40 includes a water spray pipe 410 and water spray nozzles 420. The water spray pipe 410 is located at the output end of the heat exchanger 20 and extends outward to the top of the hydraulic pump chamber. There are multiple water spray nozzles 420, which are spaced apart on the outer wall of the water spray pipe. In use, the seawater, after heat exchange with the hydraulic oil through the heat exchanger, is transported to the hydraulic pump chamber through the water spray pipe and sprayed into the hydraulic pump chamber through the water spray nozzles 420 to achieve cooling of the chamber.

[0039] Reference Figure 6 , Figure 7 , Figure 8 As a preferred technical solution in this embodiment, the buffer rod includes a fixed rod 521, a first spring damper 522, a transmission rod 523, a connecting rod 524, and a buffer rod 525. The fixed rod 521 is fixed to the bottom wall of the hydraulic oil tank and distributed along the length of the heat exchanger 20. The transmission rod 523 is distributed parallel to the fixed rod and located diagonally above the fixed rod. The transmission rod 523 is elastically connected to the transmission rod 523 through the first spring damper 522. The buffer rod 525 is distributed parallel to the transmission rod and located diagonally above the transmission rod. The buffer rod 525 is movably connected to the transmission rod through the connecting rod 524. The side of the buffer rod away from the transmission rod is connected to the fixed plate 510 through the second spring damper 526. In use, the fixed rod 521, the transmission rod 523, and the buffer rod 525 are distributed in parallel to form an integral buffer structure that can move elastically. When the heat exchanger vibrates under external force, it can drive the transmission rod and the buffer rod to swing relative to the fixed rod to absorb the vibration of the heat exchanger.

[0040] Furthermore, to achieve an effective elastic connection between the fixed rod 521 and the transmission rod 523, at least two parallel hinge rods 527 are rotatably connected to both ends of the fixed rod 521. The end of the hinge rod away from the fixed rod is rotatably connected to the transmission rod 523. Specifically, in this embodiment, there are two hinge rods 527. One end of the hinge rod is rotatably connected to the side wall of the fixed rod 521 through a rotating pin, and the other end of the hinge rod is rotatably connected to the side wall of the transmission rod through a rotating pin. In this way, the hinge rod and the first spring damper together realize the movable setting of the fixed rod and the transmission rod. When the transmission rod is subjected to force and swings relative to the fixed rod, it can effectively absorb external forces to improve the stability of the connection between the two.

[0041] Reference Figure 9 Furthermore, the buffer rod also includes a buffer block 528, a connecting rod 529, and a connecting folding rod 5210. The buffer block 528 is slidably connected to the fixed plate 510. One end of the connecting rod 529 is hinged to the buffer block, and the other end is hinged to the side wall of the heat exchanger 20. The connecting folding rod 5210 is fixed on the top of the buffer block, and its end away from the buffer block is fixedly connected to the buffer rod 525. In use, when the heat exchanger is driven to vibrate by an external force, the connecting rod 529 drives the buffer block 528 to slide on the mounting plate, thereby driving the connecting folding rod 5210 to drive the buffer rod. The buffer rod swings relative to the transmission rod under force, and the transmission rod swings relative to the fixed rod under force, thereby absorbing the horizontal vibration of the heat exchanger.

[0042] Furthermore, in order to improve the stability of the buffer block 528 sliding along the fixed plate 510, a groove 511 matching the buffer block 528 is provided on the fixed plate 510, and a buffer spring 512 is connected between the buffer block and the inner wall of the groove. In this way, when the buffer block 528 moves under force, the vibration of the heat exchanger can be further reduced.

[0043] As a preferred technical solution in this embodiment, the heat dissipation assembly includes a rotating shaft 531, a driven gear 532, a driving rack 533, and a heat dissipation fan blade 534. The rotating shaft 531 is rotatably mounted on the bottom wall of the hydraulic oil tank 10. The driven gear 532 is fixedly sleeved on the rotating shaft. The driving rack 533 is fixedly mounted on the side wall of the buffer block 528, and the driving rack meshes with the driven gear. The heat dissipation fan blade 534 is fixedly mounted on the side wall of the rotating shaft. In use, when the buffer block is driven by the connecting rod to move along the slide groove, it will synchronously drive the driving rack to move. The driving rack will then drive the driven gear to rotate, the driven gear will then drive the rotating shaft to rotate, and the rotating shaft will then drive the heat dissipation fan blade to rotate, so as to agitate the hydraulic oil inside the hydraulic oil tank, thereby further improving the heat dissipation of the hydraulic oil and preventing the hydraulic oil temperature from becoming too high.

[0044] The present invention also provides a method for temperature control of the hydraulic system of a grab dredger, comprising the following steps:

[0045] S10: When the water depth in the dredging area is sufficient to submerge the grab bucket's turtle-shaped cover, seawater is pumped into the water tank to fill it when the grab bucket enters the water to dredge. After the grab bucket emerges from the water, the seawater in the water tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank.

[0046] Specifically, due to the varying water depths in the construction areas of the grab bucket vessel, when the water depth in the construction area is sufficient to submerge the grab bucket's turtle-shaped cover, seawater is pumped into the water tank to fill it when the grab bucket enters the water to dredge the mud. After the grab bucket emerges from the water, the first water pump in the water tank is used to transport the seawater to the heat exchanger to cool the coolant in the hydraulic oil tank.

[0047] S20: When the water depth in the dredging area is insufficient to submerge the grab bucket's turtle cover, water is drawn into the water tank from the water at the bucket teeth position. After the grab bucket emerges from the water, the seawater in the water tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank.

[0048] Specifically, when the water depth in the construction area is insufficient to submerge the grab bucket's turtle cover, a second water pump in the water tank draws water from the water at the bucket teeth position and transports it to the water tank. Then, the first water pump is used to pump seawater into the heat exchanger to cool the hydraulic oil.

[0049] S30: Water that has undergone heat transfer with hydraulic oil via a heat exchanger is transported to the hydraulic pump chamber via a cooling component to cool the hydraulic pump chamber.

[0050] Specifically, seawater flows along the heat exchanger, exchanging heat with the hydraulic oil to cool it. The seawater discharged from the heat exchanger can be further transported to the cooling components, and specifically delivered to the hydraulic pump chamber through water spray pipes and spray nozzles to cool the hydraulic pump chamber.

[0051] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A temperature control device for the hydraulic system of a grab dredger, comprising a hydraulic oil tank (10), characterized in that, It also includes a heat exchanger (20) installed inside the hydraulic oil tank, a water tank (30) installed outside the hydraulic oil tank for supplying refrigerant to the heat exchanger, and a cooling component (40) installed at the output end of the heat exchanger. The end of the cooling component away from the heat exchanger extends into the hydraulic pump chamber. The inner wall of the hydraulic oil tank is also provided with a buffer mechanism, which includes a fixed plate (510), a buffer rod installed between the heat exchanger and the fixed plate for absorbing the vibration of the heat exchanger, and a heat dissipation component that meshes with the buffer rod. The water tank (30) is equipped with a first water pump (310) and a second water pump (320). The output end of the first water pump is connected to the liquid inlet of the heat exchanger, and the input end of the second water pump is connected to a suction hose (330). The end of the suction hose is equipped with a suction port (340) with a float and a mesh filter. The suction hose is also equipped with a shut-off check valve (350). The buffer rod includes a fixed rod (521) fixed to the bottom wall of the hydraulic oil tank along the length of the heat exchanger (20), a transmission rod (523) parallel to the fixed rod and elastically disposed above the fixed rod by a first spring damper (522), and a buffer rod (525) parallel to the transmission rod and movably disposed above the transmission rod by a transition rod (524). The side of the buffer rod away from the transmission rod is connected to the fixed plate (510) by a second spring damper (526). At least two parallel hinge rods (527) are rotatably connected to both ends of the fixed rod (521), and the end of the hinge rod away from the fixed rod is rotatably connected to the transmission rod (523). The buffer rod also includes a buffer block (528) slidably connected to the fixed plate (510), a connecting rod (529) with one end hinged to the buffer block and the other end hinged to the side wall of the heat exchanger (20), and a connecting folding rod (5210) fixed on the top of the buffer block and with one end away from the buffer block fixed to the buffer rod (525).

2. The temperature control device for the hydraulic system of the grab dredger according to claim 1, characterized in that, The water tank (30) is also equipped with a liquid level float switch (360).

3. The temperature control device for the hydraulic system of the grab dredger according to claim 1, characterized in that, The cooling assembly (40) includes a water spray pipe (410) disposed at the output end of the heat exchanger (20) and extending above the hydraulic pump chamber, and a water spray nozzle (420) disposed on the outer wall of the water spray pipe.

4. The temperature control device for the hydraulic system of the grab dredger according to claim 1, characterized in that, The fixed plate (510) is provided with a groove (511) that matches the buffer block (528), and a buffer spring (512) is connected between the buffer block and the inner wall of the groove.

5. The temperature control device for the hydraulic system of the grab dredger according to claim 1, characterized in that, The heat dissipation assembly includes a rotating shaft (531) rotatably mounted on the bottom wall of the hydraulic oil tank (10), a driven gear (532) fixedly mounted on the rotating shaft, a drive rack (533) fixedly mounted on the side wall of the buffer block (528) and meshing with the driven gear, and a heat dissipation fan blade (534) fixedly mounted on the side wall of the rotating shaft.

6. A method for temperature control of a grab dredger's hydraulic system, comprising the temperature control device for a grab dredger's hydraulic system as described in claim 5, characterized in that, Includes the following steps: S10: When the water depth in the dredging area can submerge the grab bucket's turtle cover, seawater is poured into the water tank to fill it when the grab bucket enters the water to dredge the mud. After the grab bucket emerges from the water, the seawater in the water tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank. S20: When the water depth in the dredging area is not deep enough to submerge the grab bucket's turtle cover, the water tank draws water from the water at the bucket teeth position into the water tank, and after the grab bucket emerges from the water, the seawater in the water tank is pumped into the heat exchanger to cool the cooling oil in the hydraulic oil tank. S30: Water that has undergone heat transfer with hydraulic oil via a heat exchanger is transported to the hydraulic pump chamber via a cooling component to cool the hydraulic pump chamber.

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