Automatic cooling water tank device

Abstract

The invention provides an automatic cooling water tank device. The automatic cooling water tank device comprises a shell, wherein a first door plate is hinged to one side of the shell; the kettle is arranged at one end in the shell; the water kettle is arranged at one end of the interior of the shell, the cooler is arranged at the other end of the interior of the shell, one side of the water kettle and one side of the cooler are communicated with the water kettle through a backflow pipe, and a water inlet and a water outlet are formed in the top and the bottom of the cooler respectively. When the output end of the motor rotates, a lead screw is driven to rotate through an arranged transmission assembly, a cleaning roller can be driven to move through rotation of the lead screw, dust on a filter plate can be cleaned through arranged bristles when the cleaning roller moves, dust and peculiar smell adsorbed on the filter plate can be removed, and the cleaning effect is improved; the cleaned dust is accumulated on the second door plate, and the dust can be cleaned by opening the second door plate.

Description

Technical Field

[0001] The invention relates to the field of cooling water tanks, in particular to an automatic cooling water tank device. Background Art

[0002] Cooling water tanks are widely used in the cooling process of mechanical equipment. A general cooling water tank includes a shell, a kettle, a cooler, a motor and a water pump. The surface of the shell is provided with a water inlet joint and a water outlet joint connected to external equipment. The water inlet joint is connected to the inlet of the cooler through a first water inlet pipe, and the outlet of the cooler is connected to the kettle through a second water inlet pipe. The inlet of the water pump is connected to the kettle through a first water outlet pipe, and the outlet of the water pump is connected to the water outlet joint of the shell through a second water outlet pipe. The motor drives the water pump to operate; the coolant flows out from the external equipment and passes through the cooler, the kettle and the water pump in turn, and then is input into the external equipment again, forming a cooling cycle to achieve cooling of the external mechanical equipment.

[0003] The prior art can refer to the Chinese patent publication number CN112856913A. The prior art is specifically a new type of cooling water tank device, including a shell, a kettle, a cooler, a fan, a motor, a spoiler pipe and a water pump. The shell surface is provided with a water inlet joint and a water outlet joint connected to an external device. The water inlet joint is connected to the inlet of the cooler through a first water inlet pipe, and the outlet of the cooler is connected to the kettle through a second water inlet pipe. The inlet of the water pump is connected to the kettle through a first water outlet pipe, and the outlet of the water pump is connected to the water outlet joint of the shell through a second water outlet pipe. The motor drives the fan and the water pump to operate; one end of the spoiler pipe is connected to the middle of the second water outlet pipe, and the other end of the spoiler pipe is connected to the kettle, and the port of the spoiler pipe communicating with the kettle is aligned with the connecting position of the first water outlet pipe and the kettle. The prior art can mainly filter dust and foreign matter.

[0004] The existing technology has the following shortcomings in actual implementation: the cleaning effect of dust and foreign matter is poor, and dust and foreign matter are easily adsorbed on the filter net. In addition, the dust and foreign matter after filtration remain inside the device, which is inconvenient for staff to clean, and excessive accumulation can easily affect the filtering effect. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes an automatic cooling water tank device to solve the above problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides an automatic cooling water tank device, comprising: a shell, one side of which is hinged with a first door panel; a kettle arranged at one end of the shell; a cooler arranged at the other end of the shell, the kettle and one side of the cooler are connected to the kettle through a reflux pipe, and the top and bottom of the kettle are respectively provided with a water inlet and a water outlet; a filter unit, arranged between the kettle and the cooler; a pumping assembly is arranged inside the shell; one side of the kettle is connected to the pumping assembly through a water supply pipe; a screw rod is rotatably arranged inside the filter unit, a slider is matched with the screw rod, a cleaning roller is arranged at the bottom of the slider, and bristles are arranged on the outer wall of the cleaning roller, and the bristles clean the inside of the filter unit; a transmission assembly is arranged on one side wall of the filter unit, and the transmission assembly is respectively connected to one end of the pumping assembly and the screw rod; a fan is arranged inside the shell; the pumping assembly includes a motor.

[0007] Furthermore: the filter unit includes a filter box and a filter plate arranged inside the filter box, the pumping assembly is connected to the filter box through a second delivery pipe, a first delivery pipe is provided at one end of the filter box, one end of the first delivery pipe is connected to the cooler, and a second door panel is hinged at the bottom of the filter box; a slide groove is provided at the inner top of the filter box, and the screw rod is rotatably installed in the slide groove; the bristles are in contact with the surface of the filter plate.

[0008] Furthermore: the pumping component includes a pumping box, a motor is arranged at one end of the pumping box, the output end of the motor passes through the pumping box, a plurality of first fan blades are arranged on the output end of the motor, and the first fan blades are located inside the pumping box; the transmission component is connected to the output end of the motor.

[0009] Furthermore: a rotating column is rotatably provided on the top of the slider, the bottom of the rotating column is fixedly connected to the top of the cleaning roller, the inner wall of the slide groove is provided with a plurality of protrusions, and the outer wall of the rotating column is provided with a plurality of grooves corresponding to the protrusions.

[0010] Further: the transmission assembly includes: an energy conversion assembly connected to the output end of the motor; a toothed plate slidably arranged on one side wall of the filter box; a first gear rotatably arranged on one side wall of the filter box and meshing with the toothed plate; a spring arranged on one side wall of the filter box, the spring being connected to one end of the toothed plate; and a second gear and a synchronous belt rotatably arranged on the side wall of the filter box; wherein the second gear is meshedly connected to the first gear, one end of the screw rod passes through the filter box, and the synchronous belt is sleeved on the second gear and one end of the screw rod.

[0011] Furthermore: a movable plate is slidably arranged inside the filter box, a plurality of ejectors are provided on one side of the movable plate, a plurality of water passages are opened on the movable plate, and the ejectors are opposite to the sieve holes on the filter plate; a cam is rotatably arranged inside the filter box, one end of the cam is rotatably connected to a linkage plate, one end of the linkage plate is hinged to the movable plate, and the linkage plate is fixedly connected to the first gear.

[0012] Furthermore: the energy conversion component includes a worm wheel and a transmission shaft, a worm is provided at the output end of the motor, the worm wheel is meshedly connected with the worm, and the transmission shaft is connected with the worm wheel.

[0013] Furthermore: the energy conversion assembly also includes an oil delivery box, a telescopic cylinder, and an oil tank, and the oil delivery box, the telescopic cylinder, and the oil tank are all arranged on the side wall of the filter box, one end of the transmission shaft extends to the interior of the oil delivery box and is provided with a plurality of second fan blades, one end of the oil delivery box is connected to the oil tank through a pipeline, and the other end of the oil delivery box is connected to one end of the telescopic cylinder, a push plate is provided inside the telescopic cylinder, the push plate is connected to a telescopic rod, one end of the telescopic rod extends to the outside of the telescopic cylinder and is connected to the tooth plate; a pressure relief assembly is provided at the bottom of the telescopic cylinder.

[0014] Furthermore, a first oil delivery pipe and a second oil delivery pipe are connected to the oil delivery tank, one end of the first oil delivery pipe is connected to one end of the oil tank, and one end of the second oil delivery pipe is connected to one end of the telescopic cylinder.

[0015] Furthermore, the pressure relief assembly includes a third oil delivery pipe, the third oil delivery pipe is close to the other end of the telescopic cylinder and is connected to the telescopic cylinder, and one end of the third oil delivery pipe is connected to the other end of the oil tank.

[0016] Compared with the prior art, the present invention has the following beneficial effects: When the output end of the motor rotates, the transmission assembly will drive the screw to rotate, and the rotation of the screw can drive the cleaning roller to move. When the cleaning roller moves, the dust on the filter plate can be cleaned by the brush bristles, and the dust and odor adsorbed on the filter plate can be removed to improve the cleaning effect. The cleaned dust is accumulated on the second door panel, and the dust can be cleaned by opening the second panel. When the cleaning roller moves, the rotating column contacts the convex block, and the convex block and the groove cause the rotating column to rotate during the movement, driving the cleaning roller to rotate synchronously, thereby further deepening the cleaning effect; When the push plate moves to the other end of the telescopic cylinder, the hydraulic oil enters the oil tank through the third oil pipe, thereby reducing the internal pressure of the telescopic cylinder, so that the telescopic rod and the toothed plate remain in position, and then the cleaning roller remains in position. During the water filtering process, the cleaning roller remains stationary. When the motor stops running, the toothed plate is reset by the spring, and the toothed plate drives the first gear to rotate, and then a series of screw rods are driven to rotate, and then the filter plate is cleaned by the cleaning roller. When the push plate moves to the other end of the telescopic cylinder, the hydraulic oil enters the oil tank through the third oil pipe, thereby reducing the internal pressure of the telescopic cylinder, so that the telescopic rod and the toothed plate remain in position, and then the cleaning roller remains in position. During the water filtering process, the cleaning roller remains stationary. When the motor stops running, the toothed plate is reset by the spring, and the toothed plate drives the first gear to rotate, and then a series of screw rods are driven to rotate, and then the filter plate is cleaned by the cleaning roller. When the first gear rotates, the cam will be driven to rotate, and the linkage plate and the movable plate will be driven to move forward and backward through the rotation of the cam. When the movable plate moves forward, the ejector pin is inserted into the sieve hole of the filter plate, which can deeply clean the filter plate to prevent blockage and improve the cleaning effect.

[0017] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the first internal structure of the present invention; Figure 3 It is a second internal structure schematic diagram of the present invention; Figure 4 is a cross-sectional view of the water pumping box of the present invention; Figure 5 It is a structural schematic diagram of the worm in the present invention; Figure 6 It is a rear view of the filter box in the present invention; Figure 7 It is a schematic diagram of the internal structure of the filter box in the present invention; Figure 8 It is a structural schematic diagram of the cam in the present invention; Fig. 9 It is a structural schematic diagram of the slider in the present invention; Fig.10 It is a schematic diagram of the internal structure of the telescopic cylinder in the present invention.

[0019] In the figure: 1, housing; 2, first door panel; 3, water inlet; 4, kettle; 5, return pipe; 6, water supply pipe; 7, cooler; 8, fan; 9, filter box; 10, first delivery pipe; 11, water pumping box; 12, motor; 13, worm; 14, worm wheel; 15, first fan blade; 16, second delivery pipe; 17, transmission shaft; 18, tooth plate; 19, first gear; 20, spring; 21, second gear; 22, synchronous belt; 23, Screw rod; 24, oil tank; 25, telescopic cylinder; 26, oil tank; 27, filter plate; 28, movable plate; 29, ejector pin; 30, cleaning roller; 31, second door panel; 32, slide groove; 33, water trough; 34, cam; 35, linkage plate; 36, slider; 37, bump; 38, push plate; 39, first oil pipeline; 40, second oil pipeline; 41, third oil pipeline; 42, second fan blade; 43, telescopic rod; 44, rotating column. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific implementation methods of the present invention are now described with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0021] Reference Figure 1-10As shown, an automatic cooling water tank device comprises: a shell 1, one side of which is hinged with a first door panel 2; a kettle 4 arranged at one end of the shell 1; a cooler 7 arranged at the other end of the shell 1, the kettle 4 and one side of the cooler 7 are connected to the kettle 4 through a reflux pipe 5, and the top and bottom of the kettle 4 are respectively provided with a water inlet 3 and a water outlet; a filtering unit, arranged between the kettle 4 and the cooler 7; a pumping box 11 is arranged inside the shell 1, one end of the pumping box 11 is provided with a motor 12, the output end of the motor 12 passes through the pumping box 11, and a plurality of first fan blades 15 are arranged on the output end of the motor 12, and the first fan blades 15 are located inside the pumping box 11; one side of the kettle 4 is connected to the pumping box 11 through a water supply pipe 6; the filtering unit comprises a filter box 9 and a filter plate 27 arranged inside the filter box 9, one side of the pumping box 11 is connected to the filter plate 27 through a second supply pipe 16 The filter box 9 is connected to each other, one end of the filter box 9 is provided with a first conveying pipe 10, one end of the first conveying pipe 10 is communicated with the cooler 7, and a second door panel 31 is hingedly connected to the bottom of the filter box 9; a slide groove 32 is provided on the inner top of the filter box 9, a screw rod 23 is rotatably provided inside the slide groove 32, a slider 36 is connected to the screw rod 23, a cleaning roller 30 is arranged at the bottom of the slider 36, and bristles are provided on the outer wall of the cleaning roller 30, and the bristles are in contact with the surface of the filter plate 27; a transmission assembly is provided on one side wall of the filter box 9, and the transmission assembly is respectively connected to the output end of the motor 12 and the screw rod 23; a fan 8 is provided inside the housing 1, a rotating column 44 is rotatably provided on the top of the slider 36, and the bottom of the rotating column 44 is fixedly connected to the top of the cleaning roller 30, the inner side wall of the slide groove 32 is provided with a plurality of protrusions 37, and a plurality of grooves corresponding to the protrusions 37 are provided on the outer wall of the rotating column 44.

[0022] The present invention provides a technical solution. When in use, water is input into and output from the kettle 4 through the water inlet 3 and the water outlet. When cooling the water, the water is transported to the inside of the filter box 9 through the water delivery pipe 6. The water is filtered by the filter plate 27 inside the filter box 9. After filtering, the water is sent to the inside of the cooler 7 through the first delivery pipe 10 for cooling. The cooling is accelerated by the fan 8, and then the water is transported to the inside of the kettle 4 through the return pipe 5. The starter motor 12 drives the first fan blade 15 to rotate to achieve the effect of pumping water, which is convenient for transporting water to the inside of the filter box 9. When the output end of the motor 12 rotates, the transmission assembly is set to drive the screw rod 23 to rotate, and the rotation of the screw rod 23 can drive the cleaning roller 30 to move. When the cleaning roller 30 moves, the dust on the filter plate 27 can be cleaned by the bristles set, and the dust and odor adsorbed on the filter plate 27 can be removed, thereby improving the cleaning effect. When the cleaning roller 30 moves, the rotating column 44 contacts the protrusion 37. Under the action of the protrusion 37 and the groove, the rotating column 44 rotates during the movement, driving the cleaning roller 40 to rotate synchronously, thereby further deepening the cleaning effect.

[0023] Preferably: the transmission assembly includes: an energy conversion assembly connected to the output end of the motor 12; a toothed plate 18 slidably arranged on a side wall of the filter box 9; a first gear 19 rotatably arranged on a side wall of the filter box 9 and meshing with the toothed plate 18; a spring 20 arranged on a side wall of the filter box 9, the spring 20 being connected to one end of the toothed plate 18; and a second gear 21 and a synchronous belt 22 rotatably arranged on the side wall of the filter box 9; wherein the second gear 21 is meshedly connected with the first gear 19, one end of the screw rod 23 passes through the filter box 9, and the synchronous belt 22 is sleeved on the second gear 21 and one end of the screw rod 23; The energy conversion assembly includes a worm gear 14 and a transmission shaft 17. A worm 13 is provided at the output end of the motor 12. The worm gear 14 is meshedly connected with the worm gear 13. The transmission shaft 17 is connected with the worm gear 14. The energy conversion assembly also includes an oil delivery box 24, a telescopic cylinder 25, and an oil tank 26. The oil delivery box 24, the telescopic cylinder 25, and the oil tank 26 are all arranged on the side wall of the filter box 9. One end of the transmission shaft 17 extends to the inside of the oil delivery box 24 and is provided with a plurality of second blades 42. One end of the oil delivery box 24 is connected to the oil tank 26 through a pipeline, and the other end of the oil delivery box 24 is communicated with one end of the telescopic cylinder 25. A push plate 38 is provided inside the telescopic cylinder 25, and the push plate 38 is connected with a telescopic rod 43. One end of the telescopic rod 43 extends to the outside of the telescopic cylinder 25 and is connected to the toothed plate 18. A pressure relief assembly is provided at the bottom of the telescopic cylinder 25; The pressure relief assembly includes a third oil pipe 41, which is close to the other end of the telescopic cylinder 25 and communicated with the telescopic cylinder 25, and one end of the third oil pipe 41 is communicated with the other end of the oil tank 26; the oil tank 24 is connected with a first oil pipe 39 and a second oil pipe 40, one end of the first oil pipe 39 is communicated with one end of the oil tank 26, and one end of the second oil pipe 40 is communicated with one end of the telescopic cylinder 25.

[0024] Specifically, when the output end of the motor 12 rotates, the worm 13 is driven to rotate, and the worm wheel 14 is driven to rotate through the worm 13, and the second fan blade 42 is driven to rotate through the worm wheel 14, so that the hydraulic oil inside the oil tank 26 can be transported to the inside of the telescopic cylinder 25, and then the telescopic rod 43 is pushed outward by pressure, and then the telescopic rod 43 pushes the toothed plate 18 to move. During the movement of the toothed plate 18, the first gear 19 is driven to rotate, and the second gear 21 is driven to rotate through the first gear 19, and the lead screw 23 is driven to rotate through the synchronous belt 22. When the push plate 38 moves to the other end of the telescopic cylinder 25, the hydraulic oil enters the interior of the oil tank 26 through the third oil pipe 41, thereby reducing the internal pressure of the telescopic cylinder 25, so that the telescopic rod 43 maintains its position and the toothed plate 18 maintains its position, thereby maintaining the cleaning roller 40 in position. During the water filtering process, the cleaning roller 40 remains stationary. When the motor 12 stops running, the toothed plate 18 is reset by the spring 20, and the toothed plate 18 drives the first gear 19 to rotate, thereby driving the screw rod 23 to rotate in a series of ways, and then the filter plate 27 is cleaned by the cleaning roller 40. The cleaned dust accumulates on the second door panel 31. The dust can be cleaned by opening the second panel 31. Through this method, the cleaning roller 40 can only rotate and move at the beginning and end of filtration to prevent affecting the filtration, and the filter plate 27 can also be effectively cleaned at the same time.

[0025] Preferably: a movable plate 28 is slidably arranged inside the filter box 9, a plurality of ejector pins 29 are provided on one side of the movable plate 28, a plurality of water passage grooves 33 are opened on the movable plate 28, and the ejector pins 29 are opposite to the sieve holes on the filter plate 27; a cam 34 is rotatably arranged inside the filter box 9, one end of the cam 34 is rotatably connected to a linkage plate 35, one end of the linkage plate 35 is hinged to the movable plate 28, and the linkage plate 35 is fixedly connected to the first gear 19.

[0026] Specifically, when the first gear 19 rotates, the cam 34 is driven to rotate, and the rotation of the cam 34 drives the linkage plate 35 and the movable plate 28 to move forward and backward. When the movable plate 28 moves forward, the ejector pin 29 is inserted into the sieve hole of the filter plate 27, which can deeply clean the filter plate 27 to prevent blockage and improve the cleaning effect.

[0027] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An automatic cooling water tank device, characterized in that: include: A housing (1), wherein a first door panel (2) is hingedly connected to one side of the housing (1); A kettle (4) disposed at one end of the interior of the housing (1); A cooler (7) is arranged at the other end of the shell (1), the kettle (4) and one side of the cooler (7) are connected to the kettle (4) via a reflux pipe (5), and the top and bottom of the kettle (4) are respectively provided with a water inlet (3) and a water outlet; A filtering unit, arranged between the kettle (4) and the cooler (7); A water pumping assembly is arranged inside the housing (1); One side of the kettle (4) is connected to the water pumping assembly via a water supply pipe (6); A screw rod (23) is rotatably arranged inside the filter unit, a slider (36) is cooperatively connected to the screw rod (23), a cleaning roller (30) is arranged at the bottom of the slider (36), and bristles are arranged on the outer wall of the cleaning roller (30), and the bristles clean the inside of the filter unit; A transmission assembly is provided on one side wall of the filter unit, and the transmission assembly is respectively connected to one end of the pumping assembly and the screw rod (23); A fan (8) is arranged inside the housing (1); The water pumping assembly comprises a motor (12).

2. The automatic cooling water tank device according to claim 1, characterized in that: The filter unit comprises a filter box (9) and a filter plate (27) arranged inside the filter box (9); the pumping assembly is connected to the filter box (9) via a second delivery pipe (16); a first delivery pipe (10) is provided at one end of the filter box (9); one end of the first delivery pipe (10) is connected to the cooler (7); and a second door panel (31) is hinged at the bottom of the filter box (9); A slide groove (32) is provided on the inner top of the filter box (9), and the screw rod (23) is rotatably mounted in the slide groove (32); The bristles are in contact with the surface of the filter plate (27).

3. The automatic cooling water tank device according to claim 1, characterized in that: The pumping assembly further comprises a pumping box (11), the motor (12) being arranged at one end of the pumping box (11), the output end of the motor (12) passing through the pumping box (11), a plurality of first fan blades (15) being arranged on the output end of the motor (12), the first fan blades (15) being located inside the pumping box (11); The transmission component is connected to the output end of the motor (12).

4. The automatic cooling water tank device according to claim 2, characterized in that: A rotating column (44) is rotatably provided at the top of the sliding block (36), the bottom of the rotating column (44) is fixedly connected to the top of the cleaning roller (30), the inner wall of the sliding groove (32) is provided with a plurality of protrusions (37), and the outer wall of the rotating column (44) is provided with a plurality of grooves corresponding to the protrusions (37).

5. The automatic cooling water tank device according to claim 2, characterized in that: The transmission assembly comprises: an energy conversion component connected to the output end of the motor (12); A toothed plate (18) slidably arranged on a side wall of the filter box (9); A first gear (19) rotatably arranged on a side wall of the filter box (9) and meshing with the toothed plate (18); A spring (20) disposed on a side wall of the filter box (9), the spring (20) being connected to one end of the tooth plate (18); and rotating a second gear (21) and a synchronous belt (22) disposed on a side wall of the filter box (9); The second gear (21) is meshedly connected with the first gear (19), one end of the screw rod (23) passes through the filter box (9), and the synchronous belt (22) is sleeved on the second gear (21) and one end of the screw rod (23).

6. The automatic cooling water tank device according to claim 5, characterized in that: A movable plate (28) is slidably arranged inside the filter box (9), a plurality of ejector pins (29) are arranged on one side of the movable plate (28), a plurality of water passage grooves (33) are provided on the movable plate (28), and the ejector pins (29) are opposite to the sieve holes on the filter plate (27); A cam (34) is rotatably arranged inside the filter box (9), one end of the cam (34) is rotatably connected to a linkage plate (35), one end of the linkage plate (35) is hinged to the movable plate (28), and the linkage plate (35) is fixedly connected to the first gear (19).

7. The automatic cooling water tank device according to claim 5, characterized in that: The energy conversion component comprises a worm wheel (14) and a transmission shaft (17); a worm (13) is provided at the output end of the motor (12); the worm wheel (14) is meshingly connected to the worm (13); and the transmission shaft (17) is connected to the worm wheel (14).

8. The automatic cooling water tank device according to claim 7, characterized in that: The energy conversion assembly further comprises an oil delivery box (24), a telescopic cylinder (25), and an oil tank (26); the oil delivery box (24), the telescopic cylinder (25), and the oil tank (26) are all arranged on the side wall of the filter box (9); one end of the transmission shaft (17) extends to the inside of the oil delivery box (24) and is provided with a plurality of second blades (42); one end of the oil delivery box (24) is connected to the oil tank (26) via a pipeline; the other end of the oil delivery box (24) is communicated with one end of the telescopic cylinder (25); a push plate (38) is provided inside the telescopic cylinder (25); the push plate (38) is connected to a telescopic rod (43); one end of the telescopic rod (43) extends to the outside of the telescopic cylinder (25) and is connected to the tooth plate (18); A pressure relief assembly is provided at the bottom of the telescopic cylinder (25).

9. An automatic cooling water tank device according to claim 8, characterized in that: A first oil delivery pipe (39) and a second oil delivery pipe (40) are connected to the oil delivery tank (24), one end of the first oil delivery pipe (39) is connected to one end of the oil tank (26), and one end of the second oil delivery pipe (40) is connected to one end of the telescopic cylinder (25).

10. The automatic cooling water tank device according to claim 8, characterized in that: The pressure relief assembly comprises a third oil delivery pipe (41), the third oil delivery pipe (41) being close to the other end of the telescopic cylinder (25) and being in communication with the telescopic cylinder (25), and one end of the third oil delivery pipe (41) being in communication with the other end of the oil tank (26).

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