Rapid liquid supplementing device for hydraulic cylinder

Abstract

The utility model discloses a rapid liquid supplementing device for a hydraulic cylinder, which belongs to the technical field of koji making machinery in the wine making industry and comprises a pressing oil cylinder, an oil liquid temporary storage tank and a large-flow liquid inlet valve, an oil cylinder piston is mounted in the pressing oil cylinder and divides the interior of the pressing oil cylinder into an oil cylinder rod cavity and an oil cylinder rodless cavity which are relatively independent. A rod cavity of the oil cylinder is communicated with an oil inlet pipe, and a rodless cavity of the oil cylinder is communicated with an oil return pipe; the large-flow liquid inlet valve comprises a valve shell installed on the pressing oil cylinder, an oil suction pipe is communicated between the oil temporary storage tank and the valve shell, and the valve shell is provided with a valve port communicated with a rodless cavity of the oil cylinder and a valve element controlling the valve port to be opened and closed through pressure in the rodless cavity of the oil cylinder. The control mechanism is used for controlling the valve core to open the valve port. When the pressing oil cylinder operates, the oil cylinder rodless cavity of the pressing oil cylinder can quickly supplement or discharge hydraulic oil, so that the operating speed of the pressing oil cylinder can be effectively increased, the operating time can be shortened, the pressing degree of a koji blank can be ensured, and the working efficiency of equipment can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of koji-making machinery in the brewing industry, and specifically relates to a rapid liquid supplementing device for a hydraulic cylinder. Background Technique

[0002] In the koji-making process of the brewing industry, at present, many enterprises use hydraulic koji presses to press koji cakes. Since a large pressing force is required when the koji cakes are formed. When selecting a hydraulic cylinder, if a small-bore hydraulic cylinder is selected, in order to obtain a large pressing force, it is necessary to increase the pressure of the hydraulic system, which requires increasing the power of the oil pump and the pressure rating of the hydraulic components. However, when the pressure of the hydraulic system is large, it will increase the leakage probability at the seals of the hydraulic system and also increase the operating noise of the system, which is not conducive to energy conservation, noise reduction and stable operation of the system; if a hydraulic cylinder with a larger bore diameter is selected, a relatively large amount of hydraulic oil needs to be provided, which requires a hydraulic pump with a larger displacement and a larger motor. At the same time, it is also necessary to select hydraulic components with a larger through diameter, but this may not meet the production capacity requirements due to the reduced operating speed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a rapid liquid supplementing device for a hydraulic cylinder, so that when the pressing hydraulic cylinder is operating, the rodless cavity of the hydraulic cylinder can quickly supplement or discharge hydraulic oil, which can effectively improve the operating speed of the pressing hydraulic cylinder, reduce the operating time, ensure the pressing degree of the koji cake, and improve the working efficiency of the equipment.

[0004] To achieve the purpose of the utility model, the technical solution adopted is: a rapid liquid supplementing device for a hydraulic cylinder, including a pressing hydraulic cylinder, an oil storage tank and a large-flow inlet valve. An oil cylinder piston is installed in the pressing hydraulic cylinder, and the oil cylinder piston divides the inside of the pressing hydraulic cylinder into a relatively independent rod cavity and rodless cavity of the oil cylinder. The rod cavity of the oil cylinder is communicated with an oil inlet pipe, and the rodless cavity of the oil cylinder is communicated with an oil return pipe; the large-flow inlet valve includes a valve housing installed on the pressing hydraulic cylinder, an oil suction pipe is communicated between the oil storage tank and the valve housing, and a valve port communicated with the rodless cavity of the oil cylinder and a valve core for controlling the opening and closing of the valve port through the pressure in the rodless cavity of the oil cylinder are provided on the valve housing; a control mechanism for controlling the valve core to open the valve port is also included.

[0005] Further, a valve rod penetrating the valve port and extending into the rodless cavity of the oil cylinder is installed in the valve housing, and the valve core is installed at the extending end of the valve rod; a locking nut is also installed on the valve rod, a spring support is installed in the housing 501, and a first return spring is also sleeved on the valve rod, and both ends of the first return spring respectively abut against the locking nut and the spring support.

[0006] Further, the valve core is conical.

[0007] Further, the control mechanism includes a housing fixed on the valve housing and a hydraulic piston slidably and sealingly engaged with the inner wall of the housing. The hydraulic piston divides the interior of the housing into a relatively independent hydraulic rod chamber and a hydraulic rodless chamber. The interior of the valve housing communicates with the hydraulic rod chamber, and the end of the valve stem without the valve core extends into the housing. A driving structure for driving the hydraulic piston to reciprocate is further provided on the housing.

[0008] Further, the driving structure is a high-pressure oil pipe connecting the hydraulic rodless chamber and the oil storage tank, and a control valve is further installed on the high-pressure oil pipe.

[0009] Further, a guide seat is further provided in the housing. The guide seat has a through hole, and a guide sleeve slidably engaged with the valve stem is provided on the guide seat.

[0010] Further, a second return spring is sleeved on the upper end of the valve stem, and both ends of the second return spring abut against the hydraulic piston and the guide seat respectively.

[0011] Further, a supplementary oil pipe is connected in parallel to the return oil pipe, and the outlet end of the supplementary oil pipe communicates with the oil storage tank.

[0012] Further, the inlet end of the suction oil pipe extends to the bottom of the oil storage tank.

[0013] Further, an air filter and a liquid level gauge are further provided on the oil storage tank.

[0014] Further, an overflow pipe is further provided in the oil storage tank.

[0015] The beneficial effects of the present utility model are as follows:

[0016] By adopting the hydraulic cylinder rapid liquid supplementing device provided by the present utility model, when the main engine hydraulic system feeds oil into the rodless chamber of the oil cylinder through the inlet oil pipe, under the action of the weight of the die pressing assembly, the piston runs downward rapidly, forming a certain vacuum degree in the rodless chamber. Under the action of the vacuum force, the valve port automatically opens, enabling the hydraulic oil in the oil storage tank to quickly enter the rodless chamber of the oil cylinder through the suction oil pipe and the valve housing passage, realizing the rapid extension of the oil cylinder piston rod. After the oil cylinder piston rod is completely extended, the vacuum state in the rodless chamber of the oil cylinder disappears, and the valve port automatically closes, and the main engine hydraulic system pressurizes. After the pressurization is completed, the main engine hydraulic system feeds oil into the rod chamber of the oil cylinder through the return oil pipe, the oil cylinder piston resets, and the oil cylinder piston rod retracts. Since the amount of hydraulic oil required to supplement the rod chamber of the oil cylinder is less, the hydraulic pressure of the main engine system can meet the oil supply requirement. However, at this time, the rodless chamber of the oil cylinder needs to quickly drain oil. On the one hand, the hydraulic oil in the rodless chamber of the oil cylinder can be quickly discharged through the inlet oil pipe communicating with the rodless chamber of the oil cylinder. On the other hand, by controlling the control mechanism to control the valve core to open the valve port, the hydraulic oil in the rodless chamber of the oil cylinder quickly drains into the oil storage tank through the valve port, the valve housing, and the suction oil pipe, and the valve core closes the valve port after the oil cylinder piston is completely reset.

[0017] When the pressing oil cylinder of the present utility model is in operation, the rodless cavity of the oil cylinder can quickly supplement or discharge hydraulic oil, which can effectively improve the operating speed of the pressing oil cylinder, reduce the operating time, ensure the pressing degree of the curved blank, and improve the working efficiency of the equipment. Description of the Drawings

[0018] The drawings illustrate exemplary embodiments of the present utility model and, together with the description thereof, are used to explain the principles of the present utility model. These drawings are included to provide a further understanding of the present utility model, and the drawings are included in this specification and form a part of this specification.

[0019] Figure 1 It is a schematic structural diagram of the rapid liquid supplement device for the hydraulic cylinder provided by the present utility model;

[0020] Figure 2 It is a schematic structural diagram of the oil storage tank;

[0021] Figure 3 It is a schematic structural diagram of the control mechanism;

[0022] Figure 4 It is a schematic structural diagram of the large-flow liquid inlet valve.

[0023] Markings in the drawings and corresponding component names:

[0024] 01, oil storage tank; 02, control valve; 03, suction oil pipe; 04, high-pressure oil pipe; 05, control mechanism; 06, large-flow liquid inlet valve; 07, supplementary oil pipe; 08, pressing oil cylinder;

[0025] 101, overflow pipe; 102, liquid level gauge; 103, air filter;

[0026] 501, housing; 502, hydraulic piston; 503, hydraulic rod cavity; 504, hydraulic rodless cavity; 505, guide seat; 506, through hole; 507, guide sleeve; 508, return spring II;

[0027] 601, valve housing; 602, valve rod; 603, valve port; 604, valve core; 605, return spring I; 606, lock nut; 607, spring support;

[0028] 801, oil cylinder piston; 802, oil cylinder rod cavity; 803, oil cylinder rodless cavity; 804, inlet oil pipe; 805, return oil pipe. Detailed Embodiments

[0029] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant content and do not limit the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings.

[0030] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The following will detail the present utility model with reference to the drawings and in conjunction with the embodiments.

[0031] As Figure 1 、 Figure 4 shown, a rapid hydraulic fluid replenishing device for a hydraulic cylinder provided by the present utility model includes a pressing hydraulic cylinder 08, a hydraulic fluid temporary storage tank 01, and a large-flow inlet valve 06; an oil cylinder piston 801 that is installed inside the pressing hydraulic cylinder 08 and is in sliding sealing fit with its inner wall divides the inside of the pressing hydraulic cylinder 08 into a relatively independent oil cylinder rod chamber 802 and an oil cylinder rodless chamber 803. The oil cylinder rodless chamber 803 is located above the oil cylinder piston 801, and the oil cylinder rod chamber 802 is located below the oil cylinder piston 801. Further, an oil inlet pipe 804 and an oil return pipe 805 are connected to the pressing hydraulic cylinder 08. The oil inlet pipe 804 is used to connect the main engine hydraulic system to the oil cylinder rod chamber 802, and the oil return pipe 805 is used to connect the main engine hydraulic system to the oil cylinder rodless chamber 803, enabling the fuel tank in the main engine hydraulic system to provide hydraulic oil for the oil cylinder rod chamber 802 and the oil cylinder rodless chamber 803.

[0032] The large-flow inlet valve 06 includes a valve housing 601 that is fixed on the cylinder block of the pressing hydraulic cylinder 08, and a valve port 603 is provided on the valve housing 601 to connect the inside of the valve housing 601 to the oil cylinder rodless chamber 803. A valve core 604 is further installed inside the valve housing 601 to control the opening and closing of the valve port 602, and the movement of the valve core 604 is controlled by the pressure in the oil cylinder rodless chamber 803. When a certain degree of vacuum is formed in the oil cylinder rodless chamber 803, under the action of the vacuum force, the valve core 604 opens the valve port 603; when the vacuum state in the oil cylinder rodless chamber 803 disappears, the valve core 604 closes the valve port 603.

[0033] To replenish hydraulic oil into the oil cylinder rodless chamber 803, a suction pipe 03 is further connected between the hydraulic fluid temporary storage tank 01 and the valve housing 601. The suction pipe 03 sucks the hydraulic oil in the hydraulic fluid temporary storage tank 01 into the valve housing 601, and through the opened valve port 603, the hydraulic oil entering the valve housing 601 enters the oil cylinder rodless chamber 803 through the valve port 603, realizing the replenishment of the oil cylinder rodless chamber 803 with oil.

[0034] After the pressing oil cylinder 08 finishes its work, the oil cylinder piston 801 in the pressing oil cylinder 08 needs to drive the oil cylinder piston rod to contract into the pressing oil cylinder 08. At this time, the hydraulic oil in the rodless cavity 803 of the oil cylinder needs to be quickly discharged. In order to enable the hydraulic oil in the rodless cavity 803 of the oil cylinder to be quickly discharged, the hydraulic cylinder quick liquid supplementing device further includes a control mechanism 05 that can control the valve core 604 to open the valve port 603. When the oil cylinder piston 801 needs to drive the oil cylinder piston rod to contract into the pressing oil cylinder 08, the control mechanism 05 drives the valve core 604 to open the valve port 603. In addition to being discharged through the oil inlet pipe 804 communicating with the rodless cavity 803 of the oil cylinder, the hydraulic oil in the rodless cavity 803 of the oil cylinder can also enter the oil storage tank 01 through the valve port 603, the valve housing 601, and the oil suction pipe 03, realizing the quick oil discharge of the rodless cavity 803 of the oil cylinder and the quick contraction of the oil cylinder piston rod.

[0035] As Figure 4 shown, in order to control the movement of the valve core 604, a valve rod 602 is further installed in the valve housing 601. The central axis of the valve rod 602 is on the same straight line as the central axis of the valve port 603, and one end of the valve rod 602 penetrates through the valve port 603 and extends into the rodless cavity 803 of the oil cylinder. The valve core 604 is installed at the extended end of the valve rod 602. That is, the valve core 604 is located in the rodless cavity 803 of the oil cylinder. When the valve core 604 abuts against the valve housing 601, the valve port 603 is opened. When the valve core 604 moves away from the valve housing 601, the valve port 603 is closed. A locking nut 606 is installed on the valve rod 602. A spring support 607 is fixedly installed on the end face of the valve housing 601 where the valve port 603 is opened. A first return spring 605 is sleeved on the valve rod 602. One end of the first return spring 605 abuts against the locking nut 606, and the other end of the first return spring 605 abuts against the spring support 607. By arranging the first return spring 605 between the locking nut 606 and the spring support 607, a certain vacuum degree is formed in the rodless cavity 803 of the oil cylinder. Under the action of the vacuum force, the first return spring 605 is stretched, and the valve core 604 moves into the rodless cavity 803 of the oil cylinder, and the valve port 603 is opened. When the vacuum state in the rodless cavity 803 of the oil cylinder disappears, the valve rod 602 is pushed away from the rodless cavity 803 of the oil cylinder by the elastic force of the first return spring 605, so that the valve core 604 abuts against the valve port 603, and the valve port 603 is closed.

[0036] In the present utility model, when it can be ensured that the valve port 603 is opened when a certain vacuum degree is formed in the rodless cavity 803 of the oil cylinder and the valve port 603 is closed when the vacuum state in the rodless cavity 803 of the oil cylinder disappears, it doesn't matter whether the spring support 607 is installed at one end of the valve housing 601 close to the pressing oil cylinder or the spring support 607 is installed at one end of the valve housing 601 far from the pressing oil cylinder.

[0037] In the present utility model, by disposing the valve core 604 within the rodless cavity 803 of the oil cylinder, it can effectively prevent the valve core 604 from opening the valve port 603 due to excessive pressure within the rodless cavity 803 of the oil cylinder, thus effectively ensuring the sealing of the valve port 603.

[0038] To avoid the movement of the oil cylinder piston 801 being affected by placing the valve core 604 within the rodless cavity 803 of the oil cylinder, a connecting pipe can also be connected between the pressing oil cylinder 08 and the valve housing 601. The two ends of the connecting pipe are respectively in communication with the rodless cavity 803 of the oil cylinder and the interior of the valve housing 601. At this time, the valve core 604 is located within the connecting pipe, and the valve port 603 communicates the interior of the valve housing 601 with the interior of the connecting pipe, such that the valve core 604 does not occupy the space of the rodless cavity 803 of the oil cylinder, and the stroke of the oil cylinder piston 801 within the pressing oil cylinder 08 does not change.

[0039] To ensure the closing effect of the valve core 604 on the valve port 603, the valve core 604 can be configured in a conical shape, such that the sealing of the valve core 604 on the valve port 603 is a line seal, enabling the valve core 604 to ensure the sealing of the valve port 603 even when worn.

[0040] As Figure 3 shown, to control the opening of the valve port 603 on the large-flow inlet valve 06, the control mechanism 05 includes a housing 501 fixed to the valve housing 601. The housing 501 and the valve housing 601 are in the same axial direction, and a hydraulic control piston 502 that is slidably and sealingly engaged with its inner wall is disposed within the housing 501. The hydraulic control piston 502 divides the interior of the housing 501 into a hydraulic control rod cavity 503 and a hydraulic control rodless cavity 504. One end of the valve stem 602 that does not install the valve core 604 penetrates the valve housing 601 and extends into the hydraulic control rodless cavity 504, and is not connected to the hydraulic control piston 502, such that the valve stem 602 does not drive the hydraulic control piston 502 to move during the process of moving into the rodless cavity 803 of the oil cylinder, but the hydraulic control piston 502 will push the valve stem 602 to move into the rodless cavity 803 of the oil cylinder when moving towards the valve stem 602. To drive the reciprocating movement of the hydraulic control piston 502, a driving structure for driving the reciprocating movement of the hydraulic control piston 502 is further provided on the housing 501.

[0041] The driving structure is a high-pressure oil pipe 04 that connects the housing 501 and the oil storage tank 01. One end of the high-pressure oil pipe 04 is in communication with the interior of the oil storage tank 01, the other end of the high-pressure oil pipe 04 is in communication with the hydraulic control rodless cavity 504, and a control valve 02 is further installed on the high-pressure oil pipe 04. To facilitate the installation of the control valve 02, the control valve 02 can be directly fixed to the oil storage tank 01, and the control valve 02 is used to control the hydraulic oil within the oil storage tank 01 to enter the hydraulic control rodless cavity 504.

[0042] Of course, in the present utility model, in addition to adopting the structure provided in the present utility model for the control mechanism 05, the movement of the hydraulic piston 502 in the control mechanism 05 can also be driven by other linear elements such as air cylinders, hydraulic cylinders, and electric telescopic rods.

[0043] When the hydraulic oil in the rodless cavity 803 of the oil cylinder needs to be quickly discharged, the control valve 02 is used to make the hydraulic oil in the oil storage tank 01 enter the hydraulic rodless cavity 504 through the high-pressure oil pipe 04. The hydraulic oil entering the hydraulic rodless cavity 504 pushes the piston towards the valve stem 602. When the hydraulic piston 502 abuts against the valve stem 602, the hydraulic piston 502 continues to move. The hydraulic piston 502 pushes the valve stem 602 into the rodless cavity 803 of the oil cylinder, causing the valve core 604 to move away from the valve port 603, and the valve port 603 is opened. At this time, in addition to the hydraulic oil in the rodless cavity 803 of the oil cylinder being quickly discharged through the oil inlet pipe 804 connecting the rodless cavity 803 of the oil cylinder to the main engine hydraulic system, the hydraulic oil in the rodless cavity 803 of the oil cylinder can also be quickly discharged into the oil storage tank 01 through the valve port 603, the valve housing 601, and the oil suction pipe 03, so that the hydraulic oil in the rodless cavity 803 of the oil cylinder is quickly discharged.

[0044] In order to prevent the reciprocating movement process of the valve stem 602 from being affected by its jitter, a guide seat 505 is also provided inside the housing 501, and a guide sleeve 507 that slidably cooperates with the valve stem 602 is provided on the guide seat 505. Here, the material of the guide sleeve 507 is not limited, and the material of the guide sleeve 507 can be arbitrarily selected as long as the movement of the valve stem 602 is ensured.

[0045] In the present utility model, no oil pipe communicating with the hydraulic rodless cavity 503 is provided on the housing 501. Therefore, when designing the control mechanism 05, in order to prevent the air pressure in the hydraulic rodless cavity 504 from affecting the movement of the hydraulic piston 502, a hole for the valve stem 602 is provided on the housing 501, and its diameter can be larger than the diameter of the valve stem 602, so that the hydraulic oil in the valve housing 601 can enter the hydraulic rodless cavity 503 through the gap between the valve cover and the housing 501; at the same time, in order to prevent the guide seat 505 from separating the hydraulic rodless cavity 503 into two independent chambers, the guide seat 505 should have a through hole 506 penetrating both end faces thereof, or the guide seat 505 directly adopts a grid structure.

[0046] A second return spring 508 is also sleeved on the upper end of the valve stem 602. One end of the second return spring 508 abuts against the hydraulic control piston 502, and the other end of the second return spring 508 abuts against the guide seat 505. By providing the second return spring 508, after the hydraulic control piston 502 moves towards the large-flow inlet valve 06, the second return spring 508 uses its own elastic force to push the hydraulic control piston 502 to reset, thereby driving the valve stem 602 to reset. In order to prevent the end of the second return spring 508 close to the hydraulic control piston 502 from tilting radially, a groove for accommodating the second return spring 508 can also be provided on the hydraulic control piston 502, so that the end of the second return spring 508 close to the hydraulic control piston 502 can also be radially restricted.

[0047] To facilitate the replenishment of hydraulic oil into the hydraulic oil storage tank 01, as Figure 1 shown, a supplementary oil pipe 07 is also connected in parallel to the return oil pipe 805 communicating with the rod chamber 802 of the oil cylinder, and the outlet end of the supplementary oil pipe 07 communicates with the hydraulic oil storage tank 01, so that the present utility model can directly replenish hydraulic oil into the hydraulic oil storage tank 01 through the return oil pipe 805 communicating with the rod chamber 802 of the oil cylinder and the supplementary oil pipe 07. Since the hydraulic oil in the rod chamber 802 of the oil cylinder is mainly used to push the piston 801 of the oil cylinder to reset, at this time, the pressing oil cylinder 08 is in a contracted state and the pressing oil cylinder 08 is not bent, so it will not affect the use of the pressing oil cylinder 08.

[0048] To ensure that hydraulic oil can enter the valve housing 601, when designing the suction oil pipe 03, the inlet end of the suction oil pipe 03 can be extended to the bottom of the hydraulic oil storage tank 01; similarly, to ensure that hydraulic oil can enter the rodless chamber 504 of the hydraulic control, the inlet end of the high-pressure oil pipe 04 can also be extended to the bottom of the hydraulic oil storage tank 01.

[0049] As Figure 2 shown, an air filter 103 and a liquid level gauge 102 are also provided on the hydraulic oil storage tank 01. To avoid the liquid level in the hydraulic oil storage tank 01 being too high, an overflow pipe 101 is also provided in the hydraulic oil storage tank 01. The height of the inlet end of the overflow pipe 101 is higher than the heights of the inlet ends of the suction oil pipe 03 and the high-pressure oil pipe 04; at the same time, the overflow pipe 101 can communicate with the oil tank in the main engine hydraulic system, so that when the liquid level of the hydraulic oil in the hydraulic oil storage tank 01 is higher than the inlet end of the overflow pipe 101, the excess hydraulic oil in the hydraulic oil storage tank can be sent into the oil tank in the main engine hydraulic system through the overflow pipe 101 for recovery.

[0050] In the present utility model, when the pressing oil cylinder 08 needs to work, the oil tank in the main engine hydraulic system supplies oil into the rodless cavity 803 of the oil cylinder through the oil inlet pipe 804. The hydraulic oil in the rodless cavity 803 of the oil cylinder pushes the hydraulic piston to move downward, and the hydraulic piston drives the piston rod of the oil cylinder to run downward quickly, so that a certain degree of vacuum is formed in the rodless cavity of the oil cylinder. Under the action of the vacuum force, the valve stem 602 moves downward against the acting force of the return spring 1 605, and the valve port 603 is opened. At the same time, under the action of the vacuum, the hydraulic oil in the oil storage tank 01 quickly enters the valve housing 601 through the oil suction pipe 03 and quickly enters the hydraulically controlled rodless cavity 504 through the high-pressure oil pipe 04, realizing the quick extension of the piston rod of the oil cylinder. When the piston rod of the oil cylinder is fully extended, the vacuum state in the rodless cavity 803 of the oil cylinder disappears. The valve stem 602 closes the valve port 603 under the action of the return spring 1 605, and the main engine hydraulic system pressurizes it.

[0051] When the piston rod of the oil cylinder retracts, since the amount of hydraulic oil that needs to be replenished in the rod chamber 802 of the oil cylinder is small, the hydraulic pressure of the main engine system can meet the oil supply requirements. At this time, the rodless cavity 803 of the oil cylinder needs to discharge oil quickly. On the one hand, the hydraulic oil in the rodless cavity 803 of the oil cylinder can be quickly discharged through the oil inlet pipe 804 connecting the rodless cavity 803 of the oil cylinder and the main engine hydraulic system. On the other hand, through the control valve 02, the hydraulic oil in the oil storage tank 01 enters the hydraulically controlled rodless cavity 504 through the high-pressure oil pipe 04. The hydraulic oil entering the hydraulically controlled rodless cavity 504 pushes the piston towards the valve stem 602. When the hydraulically controlled piston 502 abuts against the valve stem 602, the hydraulically controlled piston 502 continues to move. The hydraulically controlled piston 502 pushes the valve stem 602 into the rodless cavity 803 of the oil cylinder, making the valve core 604 away from the valve port 603, and the valve port 603 is opened. At this time, in addition to the hydraulic oil in the rodless cavity 803 of the oil cylinder being quickly discharged through the oil inlet pipe 804 connecting the rodless cavity 803 of the oil cylinder and the main engine hydraulic system, the hydraulic oil in the rodless cavity 803 of the oil cylinder can also be quickly discharged into the oil storage tank 01 through the valve port 603, the valve housing 601, and the oil suction pipe 03, so that the hydraulic oil in the rodless cavity 803 of the oil cylinder is quickly discharged. When the oil cylinder piston 801 is fully reset, the control valve 02 suspends sending the hydraulic oil in the oil storage tank 01 into the hydraulically controlled rodless cavity 504. The return spring 2 508 pushes the hydraulically controlled piston 502 to reset by its own elastic force. After the valve stem 602 loses the thrust of the hydraulically controlled piston 502, the return spring 1 605 pushes the valve stem 602 to reset by its own elastic force, and the valve core 604 closes the valve port 603.

[0052] By using the quick hydraulic fluid replenishing device for a hydraulic cylinder of the present utility model, it is possible to achieve that when a hydraulic bending press uses a pressing oil cylinder 08 with a large diameter, a hydraulic pump with a smaller displacement and a motor with a smaller power can also obtain a larger pressing force and higher production capacity.

[0053] In the description of this specification, the description with reference to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0054] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0055] Those skilled in the art should understand that the above embodiments are only for clearly explaining the present invention and not for limiting the scope of the present invention. For those skilled in the art, other changes or modifications can be made on the basis of the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A rapid liquid replenishing device for a hydraulic cylinder, characterized in that, It includes a pressing oil cylinder (08), an oil storage tank (01) and a large-flow inlet valve (06). An oil cylinder piston (801) is installed in the pressing oil cylinder (08). The oil cylinder piston (801) divides the inside of the pressing oil cylinder (08) into a relatively independent rod chamber (802) and a rodless chamber (803) of the oil cylinder. The rod chamber (802) of the oil cylinder is connected with an oil inlet pipe (804), and the rodless chamber (803) of the oil cylinder is connected with an oil return pipe (805); the large-flow inlet valve (06) includes a valve housing (601) installed on the pressing oil cylinder (08). An oil suction pipe (03) is connected between the oil storage tank (01) and the valve housing (601), and a valve port (603) communicating with the rodless chamber (803) of the oil cylinder and a valve core (604) for opening and closing the valve port through a pressure control valve (02) in the rodless chamber (803) of the oil cylinder are provided on the valve housing (601); it further includes a control mechanism (05) for controlling the valve core (604) to open the valve port (603).

2. The hydraulic cylinder rapid liquid replenishing device according to claim 1, characterized in that, A valve rod (602) extending through the valve port (603) into the rodless chamber (803) of the oil cylinder is installed in the valve housing (601), and the valve core (604) is installed at the extending end of the valve rod (602); a locking nut (606) is further installed on the valve rod (602), a spring support (607) is installed in the housing (501), and a first return spring (605) is further sleeved on the valve rod (602). The two ends of the first return spring (605) respectively abut against the locking nut (606) and the spring support (607).

3. The hydraulic cylinder rapid liquid replenishment device according to claim 1 or 2, characterized in that, The valve core (604) is conical in shape.

4. The rapid liquid replenishment device for a hydraulic cylinder according to claim 1 or 2, characterized in that, The control mechanism (05) includes a housing (501) fixed on the valve housing (601) and a hydraulic control piston (502) slidably and sealingly matched with the inner wall of the housing (501). The hydraulic control piston (502) divides the inside of the housing (501) into a relatively independent hydraulic control rod chamber (503) and a hydraulic control rodless chamber (504). The inside of the valve housing (601) is connected with the hydraulic control rod chamber (503), and one end of the valve rod (602) without the valve core (604) extends into the housing (501); a driving structure for driving the hydraulic control piston (502) to reciprocate is further provided on the housing (501).

5. The rapid liquid replenishment device for a hydraulic cylinder according to claim 4, wherein The driving structure is a high-pressure oil pipe (04) connecting the hydraulic control rodless chamber (504) and the oil storage tank (01), and a control valve (02) is further installed on the high-pressure oil pipe (04).

6. The rapid liquid supplementing device for a hydraulic cylinder according to claim 4, wherein, A guide seat (505) is further provided in the housing (501). The guide seat (505) has a through hole (506), and a guide sleeve (507) slidably matched with the valve rod (602) is provided on the guide seat (505).

7. The hydraulic cylinder rapid liquid supplementing device according to claim 6, wherein A second return spring (508) is further sleeved on the upper end of the valve rod (602). The two ends of the second return spring (508) respectively abut against the hydraulic control piston (502) and the guide seat (505).

8. The hydraulic cylinder rapid liquid supplementing device according to claim 1 or 2, characterized in that, A supplementary oil pipe (07) is connected in parallel to the oil return pipe (805), and the outlet end of the supplementary oil pipe (07) is connected with the oil storage tank (01).

9. The hydraulic cylinder rapid liquid supplementing device according to claim 1 or 2, characterized in that, The inlet end of the oil suction pipe (03) extends to the bottom of the oil storage tank (01).

10. The hydraulic cylinder rapid liquid replenishing device according to claim 1 or 2, characterized in that, An air filter (103) and a liquid level gauge (102) are also provided on the oil storage tank (01).

11. The hydraulic cylinder rapid liquid replenishing device according to claim 1 or 2, characterized in that, An overflow pipe (101) is also arranged in the oil storage tank (01).

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