Integrated control valve and hydraulic oil cylinder

Abstract

The integrated control valve comprises a valve body, a first balance valve, a second balance valve and a third balance valve, a first oil port, a second oil port, a third oil port and a fourth oil port are formed in the valve body, a first through oil channel is formed between the first oil port and the second oil port, and a second through oil channel is formed between the third oil port and the fourth oil port. A second through oil duct is arranged between the third oil port and the fourth oil port, the first balance valve and the second balance valve are connected to the first through oil duct in series, and the third balance valve is connected to the second through oil duct in series. The hydraulic oil cylinder comprises the integrated control valve, a cylinder barrel and a piston rod assembly. The integrated control valve serves as the cylinder bottom of the hydraulic oil cylinder and is of an integrated structure with the cylinder body, use of hydraulic pipelines is reduced, the attractiveness of the oil cylinder can be improved, further, two balance valves are connected to the rodless cavity oil way of the oil cylinder in series, the reliability of the oil cylinder in the loaded retraction and static state is improved, and the service life of the oil cylinder is prolonged. And therefore, the use safety of the platform of the aerial work ladder truck is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to an integrated control valve and hydraulic cylinder. Background Technology

[0002] Currently, with the continuous improvement and development of hydraulic technology and the market in construction machinery, the application demand for aerial work platforms is increasing year by year. The demand for hydraulic cylinders, the actuators of these platforms, is also increasing dramatically. Along with market expansion and increased demand, customers are becoming increasingly stringent in their requirements for the stability and reliability of hydraulic cylinders. To gain market share, manufacturers are actively improving and innovating, continuously enhancing performance while ensuring cost control.

[0003] Currently, the requirements for stability, balance, and safety of aerial work platforms are becoming increasingly stringent. Consequently, the performance requirements for hydraulic cylinders have also been comprehensively improved. To prevent the hydraulic cylinder from shifting downwards and to stabilize the load, a balance valve has been introduced for load control. To better ensure pressure stability on both the rod and rodless sides, dual balance valves have also emerged. Existing dual balance valves are generally installed as an independent unit on one side of the hydraulic cylinder of the aerial work platform. The dual balance valve and the cylinder are connected via hydraulic lines. The hydraulic lines and balance valves on the side wall of the hydraulic cylinder somewhat affect its overall aesthetics. Furthermore, market feedback in the past two years has revealed that balance valves connected to the rodless side generally fail before those connected to the rod side, affecting the performance of the hydraulic cylinder and reducing the safety performance of the aerial work platform. Utility Model Content

[0004] The purpose of this utility model is to provide an integrated control valve and hydraulic cylinder. The integrated control valve is integrated into the cylinder bottom and cylinder body of the hydraulic cylinder, which reduces the use of hydraulic pipelines and improves the aesthetics of the cylinder. Furthermore, two balance valves are connected in series in the oil circuit of the rodless chamber of the cylinder, which improves the reliability of the cylinder under load and in the static state, thereby improving the platform safety of the aerial work platform vehicle.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an integrated control valve, including a valve body, the control valve further including a first balancing valve, a second balancing valve, and a third balancing valve, a first oil port, a second oil port, a third oil port, and a fourth oil port provided on the valve body, a first through oil passage provided between the first oil port and the second oil port, a second through oil passage provided between the third oil port and the fourth oil port, the first balancing valve and the second balancing valve connected in series on the first through oil passage, the first balancing valve being adjacent to the first oil port, the third balancing valve connected in series on the second through oil passage, the external control oil ports of the first balancing valve and the second balancing valve communicating with the second through oil passage located between the third balancing valve and the fourth oil port, and the external control oil port of the third balancing valve communicating with the first through oil passage located between the first balancing valve and the first oil port.

[0006] Preferably, the second balancing valve is an atmospheric balancing valve.

[0007] Furthermore, the first balancing valve, the second balancing valve, and the third balancing valve are all threaded cartridge balancing valves.

[0008] A hydraulic cylinder includes a cylinder barrel and a piston rod assembly, the piston rod assembly being sleeved inside the cylinder barrel. The piston rod assembly includes a piston and a piston rod. The hydraulic cylinder also includes an integrated control valve as described above, the valve body being fixedly disposed at the bottom of the cylinder barrel, and a second oil port communicating with the rodless chamber of the cylinder barrel, and a third oil port communicating with the rod chamber of the cylinder barrel.

[0009] Furthermore, a first hinge hole is provided on the side of the valve body away from the cylinder, and a second hinge hole is provided at the outer end of the piston rod.

[0010] Furthermore, a telescopic dust cover is provided between the outer end of the piston rod and the front end of the cylinder.

[0011] The beneficial effects of this utility model are as follows: This utility model has a simple structure and is convenient to process and manufacture; the valve body is directly fixed to the bottom of the cylinder as the cylinder bottom, so that the cylinder and valve body are integrated into one structure, which simplifies the appearance of the cylinder and the number of hydraulic pipelines used, thereby improving the overall aesthetics of the hydraulic cylinder; balance valves are provided on the oil passages connecting the rodless chamber and the rod chamber of the valve body and the cylinder, and the back pressure of the balance valves is used to balance the load, thereby improving the extension and retraction stability of the hydraulic cylinder. At the same time, two balance valves are connected in series on the oil passage connecting the rodless chamber of the valve body and the cylinder, which makes the stability and reliability of the cylinder retraction under load higher, thereby improving the safe service life of the platform of the aerial work platform. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a hydraulic schematic diagram of the control valve in this utility model;

[0014] Figure 2 This is a hydraulic schematic diagram of the present invention;

[0015] Figure 3 A schematic diagram of the combination of a hydraulic cylinder and an integrated control valve;

[0016] In the diagram: 1 Valve body, 11 First oil port, 12 Second oil port, 13 Third oil port, 14 Fourth oil port, 15 First through oil passage, 16 Second through oil passage, 17 First hinge hole, 2 First balance valve, 21 First external control oil port, 3 Second balance valve, 31 Second external control oil port, 4 Third balance valve, 41 Third external control oil port, 5 Cylinder, 51 Rodless chamber, 52 Rod chamber, 6 Piston rod, 61 Second hinge hole, 7 Telescopic dust cover. Detailed Implementation

[0017] The following will describe specific embodiments and appendices. Figure 1-3 The technical solutions in the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some preferred embodiments of this utility model, and not all embodiments. Those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] This utility model provides an integrated control valve (such as...) Figure 1As shown), the control valve includes a valve body 1, and further includes a first balance valve 2, a second balance valve 3, and a third balance valve 4. The valve body 1 has a first oil port 11, a second oil port 12, a third oil port 13, and a fourth oil port 14. When the valve body 1 needs to be connected to a corresponding hydraulic pipeline, the first oil port 11, the second oil port 12, the third oil port 13, and the fourth oil port 14 are all threaded holes to allow for the installation of hydraulic pipe fittings. A first through oil passage 15 is provided between the first oil port 11 and the second oil port 12. In practical applications, a second through oil passage 16 is provided between the third oil port 13 and the fourth oil port 14. During actual processing, the valve body 1 is used to... The first through oil passage 15 and the second through oil passage 16 can be machined on the valve body 1 by machining. The first balance valve 2 and the second balance valve 3 are connected in series on the first through oil passage 15, and the first balance valve 2 is adjacent to the first oil port 11. After high-pressure oil is introduced into the first oil port 11, the one-way oil passage function of the first balance valve 2 and the second balance valve 3 is opened, so that the high-pressure oil can smoothly enter the second oil port. When hydraulic oil enters the second oil port 12, the overflow back pressure function of the first balance valve 2 and the second balance valve 3 is opened, so that the hydraulic oil in the second oil port 12 can increase to a certain pressure before it can pass through the first balance valve 2 and the second balance valve 3 and enter the first oil port 11. The third balance valve 4 is connected in series with the second through oil passage 16. After high-pressure oil is introduced into the fourth oil port 14, the one-way oil passage function of the third balance valve 4 is activated, allowing the high-pressure oil to smoothly enter the third oil port 13. When hydraulic oil enters the third oil port 13, the overflow back pressure function of the third balance valve 4 is activated, causing the hydraulic oil in the third oil port 13 to increase to a certain pressure before it can pass through the third balance valve 4 and enter the fourth oil port 14. The external control ports of the first balance valve 2 and the second balance valve 3 are connected to the second through oil passage 16 located between the third balance valve 4 and the fourth oil port 14. Specifically, the external control ports of the first balance valve 2 and the second balance valve 3 are respectively the first external control ports of the second balance valve 2 and the second balance valve 3. The first external control port 21 and the second external control port 31 are both connected to the second through oil passage 16 located between the third balance valve 4 and the fourth oil port 14. The external control port of the third balance valve 4 is connected to the first through oil passage 15 located between the first balance valve 2 and the first oil port 11. Specifically, the third external control port of the third balance valve 4 is connected to the first through oil passage 15 located between the first balance valve 2 and the first oil port 11. In practical applications, by introducing hydraulic oil with a certain pressure into the above-mentioned external control ports, the overflow back pressure function of the corresponding first balance valve 2, second balance valve 3 and third balance valve 4 can be opened.

[0019] Based on the above embodiments, in order to improve the control accuracy of the second balancing valve 3, the second balancing valve 3 is made to be a one-way atmospheric balancing valve; in order to facilitate the smooth installation and removal of the first balancing valve 2, the second balancing valve 3 and the third balancing valve 4 on the valve body 1, the first balancing valve 2, the second balancing valve 3 and the third balancing valve 4 are all threaded cartridge balancing valves. Furthermore, the specific product models of the first balancing valve 2 and the third balancing valve 4 are CBBG-LJN, and the specific product model of the second balancing valve 3 is CABG-LHN.

[0020] This utility model also provides a hydraulic cylinder (such as...) Figure 3 As shown, the hydraulic cylinder includes a cylinder 5 and a piston rod assembly. The piston rod assembly is fitted inside the cylinder 5. The piston rod assembly includes a piston and a piston rod 6. The piston is fixedly installed at one end of the piston rod 6 and is slidably fitted inside the cylinder 5. The hydraulic cylinder also includes the integrated control valve described in the above embodiment. The valve body 1 is fixedly installed at the bottom of the cylinder 5. In practical applications, the valve body 1 can be directly welded to the bottom of the cylinder 5, thereby realizing an integrated structure design of the cylinder and the valve body 1, which can reduce the use of hydraulic pipelines and improve the overall aesthetics of the hydraulic cylinder. The second oil port 12 is connected to the rodless cavity 51 of the cylinder 5, and the third oil port 13 is connected to the rod cavity 52 of the cylinder 5. Specifically, the second oil port 12 is directly connected to the bottom of the rodless cavity 51. A stainless steel oil pipe is provided on the outside of the cylinder 5. One end of the stainless steel oil pipe is connected to the right side of the rodless cavity 52, and the other end of the stainless steel oil pipe is connected to the third oil port 13. In practical applications, when the hydraulic cylinder needs to extend, high-pressure oil is supplied to the first port 11. As the high-pressure oil pushes the piston in the rodless chamber 51, the third balance valve 4 opens under the action of externally controlled pilot oil, thus enabling piston movement. During piston movement, the third balance valve 4 provides back pressure, thereby achieving stable extension of the hydraulic cylinder. When the hydraulic cylinder needs to retract, high-pressure oil is supplied to the fourth port 14. As the high-pressure oil pushes the piston in the rod chamber 52, the first balance valve 2 and the second balance valve 3 open under the action of externally controlled pilot oil, thus enabling piston movement. During piston movement, the second balance valve 2 and the third balance valve 3 provide back pressure, thereby achieving stable retraction of the hydraulic cylinder. In practical applications, if the second balance valve 2 or the third balance valve 3 fails, the remaining balance valves can still provide back pressure, thereby improving the retraction stability of the hydraulic cylinder.

[0021] To facilitate the hinged installation of the hydraulic cylinder, a first hinge hole 17 is provided on the side of the valve body 1 away from the cylinder 5, and a second hinge hole 61 is provided at the outer end of the piston rod 6. Furthermore, to improve the dustproof function of the piston rod 6, a telescopic dustproof sleeve 7 is provided between the outer end of the piston rod 6 and the front end of the cylinder 5. The piston rod 6 is fitted inside the telescopic dustproof sleeve 7, and the telescopic dustproof sleeve 7 moves synchronously with the piston rod 6.

[0022] In this utility model, "upper", "lower", "front", "back", "left", and "right" are all relative positions used to facilitate the description of positional relationships, and therefore cannot be understood as absolute positions as limitations on the scope of protection.

[0023] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

[0024] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. For those skilled in the art, several improvements and modifications can be made without departing from the concept of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An integrated control valve, comprising a valve body, characterized in that, The control valve further includes a first balancing valve, a second balancing valve, and a third balancing valve. A first oil port, a second oil port, a third oil port, and a fourth oil port are provided on the valve body. A first through oil passage is provided between the first oil port and the second oil port, and a second through oil passage is provided between the third oil port and the fourth oil port. The first balancing valve and the second balancing valve are connected in series on the first through oil passage, with the first balancing valve adjacent to the first oil port. The third balancing valve is connected in series on the second through oil passage. The external control oil ports of the first and second balancing valves communicate with the second through oil passage located between the third balancing valve and the fourth oil port. The external control oil port of the third balancing valve communicates with the first through oil passage located between the first balancing valve and the first oil port.

2. The integrated control valve according to claim 1, characterized in that, The second balancing valve is an atmospheric balancing valve.

3. The integrated control valve according to claim 2, characterized in that, The first, second, and third balancing valves are all threaded cartridge balancing valves.

4. A hydraulic cylinder, comprising a cylinder barrel and a piston rod assembly, wherein the piston rod assembly is sleeved within the cylinder barrel, and the piston rod assembly comprises a piston and a piston rod, characterized in that... The hydraulic cylinder further includes an integrated control valve according to any one of claims 1-3, wherein the valve body is fixedly disposed at the bottom of the cylinder barrel, and the second oil port is connected in communication with the rodless chamber of the cylinder barrel, and the third oil port is connected in communication with the rod chamber of the cylinder barrel.

5. The hydraulic cylinder according to claim 4, characterized in that, A first hinge hole is provided on the side of the valve body away from the cylinder, and a second hinge hole is provided at the outer end of the piston rod.

6. The hydraulic cylinder according to claim 5, characterized in that, A telescopic dust cover is provided between the outer end of the piston rod and the front end of the cylinder.

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