Hydraulic oil cylinder convenient to assemble

Abstract

The utility model discloses a hydraulic oil cylinder convenient to assemble, particularly relates to the technical field of engineering machinery, and comprises an oil cylinder body, a rodless cavity and a rod cavity are arranged in the oil cylinder body, a balance valve body connected with the rodless cavity and the rod cavity is arranged on the outer side of the oil cylinder body, and a pair of exhaust pipes is fixedly connected to the outer surface of the oil cylinder body. The pair of exhaust pipes are communicated with the rodless cavity and the rod cavity respectively, each exhaust pipe is provided with an installation assembly, each installation assembly is provided with a pressure measuring connector, the outer side of each pressure measuring connector is provided with an exhaust assembly, and the exhaust assemblies are connected with the pressure measuring connectors; the outer surface of the oil cylinder body is fixedly connected with a pair of oil pipes, the pair of oil pipes are respectively communicated with the rodless cavity and the rod cavity, and the pair of oil pipes are respectively connected with an oil inlet and an oil outlet of the balance valve body; the technical problems that when the telescopic length of the piston rod is adjusted due to assembly of the hydraulic oil cylinder, the assembly workload is large, and the control precision of the balance valve is affected are solved.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and more specifically, to a hydraulic cylinder that is easy to assemble. Background Technology

[0002] Hydraulic cylinders are the most common actuators in the construction machinery industry. They typically consist of a cylinder barrel, piston, seals, and inlet / outlet ports. When pressurized oil enters through the inlet, it pushes the piston to move; when oil flows out through the outlet, the piston returns to its original position under the action of a spring or other external force. This reciprocating motion can drive various mechanical components, such as the bucket of an excavator and the boom of a crane, to complete their actions. For some special actions, such as the column lifting of a milling machine or the oscillation of a conveyor belt, the piston rod of the cylinder needs to be precisely extended to the required length to maintain pressure. This can be achieved through the pressure-holding function of a balance valve.

[0003] Currently, hydraulic cylinders with balance valves are manufactured with the piston rod retracted to its minimum position for ease of transport and to prevent damage. However, when assembled into the final product, the piston rod needs to extend to the appropriate assembly length, requiring an adjustable piston rod during assembly. Since the piston rod of a hydraulic cylinder with a balance valve is not retractable, manually pulling the piston rod will compress air in the rod chamber, increasing pressure, and create a vacuum in the rodless chamber, both of which will prevent piston rod movement. Therefore, when adjusting the piston rod's extension length during assembly, the balance valve core must be removed before reassembly. This method increases the assembly workload and also affects the control accuracy of the balance valve. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can address the issue that the increased assembly workload and reduced control accuracy of the balance valve due to the increased length of the hydraulic cylinder adjusting piston rod.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic cylinder that is easy to assemble, comprising a cylinder body, wherein the cylinder body has a rodless chamber and a rod chamber inside, and a balance valve body connected to the rodless chamber and the rod chamber is disposed on the outer side of the cylinder body. A pair of exhaust pipes are fixedly connected to the outer surface of the cylinder body, and the pair of exhaust pipes are respectively connected to the rodless chamber and the rod chamber. Each exhaust pipe is provided with a mounting assembly, and a pressure testing connector is provided on the mounting assembly. An exhaust assembly is disposed on the outer side of the pressure testing connector, and the exhaust assembly is connected to the pressure testing connector.

[0006] In a preferred embodiment, a pair of oil pipes are fixedly connected to the outer surface of the cylinder body. The pair of oil pipes are respectively connected to the rodless chamber and the rod chamber, and the pair of oil pipes are respectively connected to the oil inlet and oil outlet of the balance valve body.

[0007] In a preferred embodiment, the mounting assembly includes a first flange, which is fixedly connected to one end of the exhaust pipe. A second flange is bolted to the end face of the first flange, and one end of the pressure testing connector is fixedly connected to the end face of the second flange.

[0008] In a preferred embodiment, a sealing gasket is provided between flange one and flange two.

[0009] In a preferred embodiment, the exhaust assembly includes a shroud disposed outside the pressure testing connector. A pin is fixedly connected to the inner wall of the shroud, and the pin is coaxially corresponding to the pressure testing connector. The pin is movably connected to the valve core of the pressure testing connector, and an exhaust port is provided at one end of the shroud.

[0010] In a preferred embodiment, the inner wall of the cylindrical cover is provided with internal threads, and the outer surfaces of flange one and flange two are both provided with external threads. The cylindrical cover is connected to the external threads through the internal threads.

[0011] In a preferred embodiment, one end of the cylindrical cover is provided with a cap, and a rubber plug is fixedly connected to the end face of the cap. The rubber plug is inserted into the exhaust hole.

[0012] In a preferred embodiment, a fixing strip 1 is fixedly connected to the outer surface of the cover, and a fixing strip 2 is fixedly connected to the end face of the flange 2. The fixing strip 1 and the fixing strip 2 are connected by bolts, and one end of the bolts penetrates through the cover.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] This easy-to-assemble hydraulic cylinder features pressure testing connectors on the cylinder corresponding to the rodless and rod chambers. The cylinder cover is screwed in to control the insertion of the push rod into the pressure testing connector. By pushing the valve core in the pressure testing connector, the rodless and rod chambers are connected to the atmosphere through the corresponding pressure testing connectors. This allows the piston rod in the cylinder body to be easily moved by hand to adjust the extension and retraction length of the piston rod during assembly. Furthermore, the piston rod can be adjusted without disassembling the balance valve, which is quite convenient. Attached Figure Description

[0015] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the exhaust pipe, mounting assembly, pressure testing connector, and exhaust assembly of this utility model;

[0018] Figure 3 This is a schematic diagram of the installation component of this utility model;

[0019] Figure 4 This is a cross-sectional view of the exhaust assembly of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the cap of this utility model.

[0021] The attached diagram is labeled as follows: 1. Cylinder body; 2. Balance valve body; 21. Oil pipe; 3. Exhaust pipe; 4. Mounting assembly; 41. Flange 1; 42. Flange 2; 5. Pressure test connector; 6. Exhaust assembly; 61. Cylinder cover; 62. Ejector pin; 63. Exhaust hole; 7. Internal thread; 8. External thread; 9. Cover; 10. Rubber plug; 11. Fixing strip 1; 12. Fixing strip 2; 13. Sealing gasket. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] See also Figures 1-5 This utility model provides a hydraulic cylinder that is easy to assemble, including a cylinder body 1. The cylinder body 1 has a rodless chamber and a rod chamber inside. A balance valve body 2 is provided on the outside of the cylinder body 1 and is connected to the rodless chamber and the rod chamber. A pair of oil pipes 21 are fixedly connected to the outer surface of the cylinder body 1. The pair of oil pipes 21 are respectively connected to the rodless chamber and the rod chamber, and the pair of oil pipes 21 are respectively connected to the oil inlet and oil outlet of the balance valve body 2.

[0024] The cylinder body 1 is the actuator in the hydraulic system. It drives the piston to move by the pressure of hydraulic oil, thereby realizing linear reciprocating motion. The input is the flow rate and pressure of the liquid, and the output is linear speed and force. The rodless chamber and the rod chamber are separated by the piston in the cylinder body 1. The balance valve body 2 can adjust the pressure difference between the rodless chamber and the rod chamber of the cylinder body 1 through the corresponding oil pipe 21. The balance valve body 2 is a hydraulic component used to control the movement speed of the actuator and ensure the movement position of the actuator. It is mainly used to prevent the load from falling or rising due to its own weight. Since the balance valve body 2 is a general standard part or a component known to those skilled in the art, it will not be described in detail here.

[0025] In this embodiment, a pair of exhaust pipes 3 are fixedly connected to the outer surface of the cylinder body 1, and the pair of exhaust pipes 3 are respectively connected to the rodless chamber and the rod chamber.

[0026] The advantage of connecting the rodless chamber and the rod chamber with a pair of exhaust pipes 3 is that, before the cylinder body 1 leaves the factory, in order to facilitate the transportation of the cylinder body 1 and prevent the piston rod from being bumped, the piston rod needs to be retracted to its minimum state. When assembling it into the complete product, the piston rod needs to be manually pulled to control the piston rod to extend to the appropriate assembly length. Therefore, the piston rod needs to be adjustable. However, the rod chamber and the rodless chamber of the cylinder body 1 with the balance valve body 2 are both in a closed state. When the piston rod is manually pulled, the rod chamber will compress the air, increasing the pressure, and the rodless chamber will become a vacuum, both of which will prevent the piston rod from being pulled out. The traditional way to adjust the piston rod is to remove the balance valve to allow the rodless chamber and the rod chamber to communicate with the atmosphere. This assembly method increases the assembly workload and also affects the control accuracy of the oil pressure by the balance valve body 2.

[0027] In this embodiment: each exhaust pipe 3 is provided with an installation component 4, and the installation component 4 is provided with a pressure test connector 5. The installation component 4 includes a flange 41, which is fixedly connected to one end of the exhaust pipe 3. The end face of the flange 41 is connected to a flange 42 by bolts, and one end of the pressure test connector 5 is fixedly connected to the end face of the flange 42.

[0028] The bolts of flange 1 41 and flange 2 42 can stabilize the pressure test connector 5 at the exhaust position on the exhaust pipe 3. The model of pressure test connector 5 is PPT-3. When the valve core of pressure test connector 5 is pushed by the external structure, it can form a pressure transmission channel. Then the rod chamber and the rodless chamber can be connected to the atmosphere through the corresponding pressure test connector 5. In this way, the piston rod in the cylinder body 1 can adjust the extension length with minimum moving resistance.

[0029] In this embodiment, a sealing gasket 13 is provided between flange 1 41 and flange 2 42.

[0030] In this application, both flange 1 41 and flange 2 42 have sealing grooves for mating gaskets on their opposite surfaces. After flange 1 41 and flange 2 42 are connected by bolts, the gasket 13 located between flange 1 41 and flange 2 42 can improve the connection sealing performance and ensure the reliability of the connection between exhaust pipe 3 and pressure test connector 5.

[0031] In this embodiment: an exhaust assembly 6 is provided on the outside of the pressure testing connector 5. The exhaust assembly 6 is connected to the pressure testing connector 5. The exhaust assembly 6 includes a cylindrical cover 61, which is provided on the outside of the pressure testing connector 5. A pin 62 is fixedly connected to the inner wall of the cylindrical cover 61. The pin 62 is coaxially corresponding to the pressure testing connector 5. The pin 62 is movably connected to the piston of the pressure testing connector 5. An exhaust hole 63 is provided at one end of the cylindrical cover 61.

[0032] When the piston rod needs to be extended to a suitable assembly length due to the assembly of the cylinder body 1, the cylinder cover 61 can be moved. The movement of the cylinder cover 61 can drive the ejector pin 62 to enter along the end of the pressure test connector 5. The ejector pin 62 can push the valve core when it is inserted into the pressure test connector 5. In this way, the exhaust pipe 3 can be connected to the atmosphere through the pressure test connector 5 at the exhaust port 63 position. This also directly realizes the connection between the rodless chamber and the rod chamber and the atmosphere. In this way, the operator can manually pull the piston rod to extend and retract to the specified assembly length.

[0033] In this embodiment: the inner wall of the cylindrical cover 61 is provided with an internal thread 7, and the outer surfaces of flange 1 41 and flange 2 42 are both provided with external threads 8. The cylindrical cover 61 is threadedly connected to the external threads 8 through the internal thread 7.

[0034] The sleeve 61 can achieve threaded feed movement on flange 41 and flange 42 through the threaded engagement of internal thread 7 and external thread 8. In this way, the sleeve 61 can control the ejector pin 62 to perform insertion-type opening and closing control on the pressure test connector 5. The insertion stability is high, which can avoid the need to disassemble and assemble the balance valve body 2 during the assembly process of the cylinder body 1, thus avoiding affecting the assembly efficiency.

[0035] In this embodiment: a cover 9 is provided at one end of the cylindrical cover 61, and a rubber plug 10 is fixedly connected to the end face of the cover 9. The rubber plug 10 is inserted into the exhaust hole 63.

[0036] When the pressure testing connector 5 is used as the medium for exhaust, the rodless chamber and the rod chamber need to be connected to the atmosphere through the exhaust hole 63 on the sleeve 61 when exhausting. When the pressure testing connector 5 is closed, the rubber plug 10 is inserted into the exhaust hole 63 by the cover 9. In this way, the sleeve 61 can seal the position of the pressure testing connector 5 to ensure the reliability of the pressure testing connector 5.

[0037] In this embodiment: a fixing strip 11 is fixedly connected to the outer surface of the cover 9, and a fixing strip 12 is fixedly connected to the end face of the flange 42. The fixing strip 11 and the fixing strip 12 are connected by bolts, and one end of the bolts passes through the sleeve 61.

[0038] To prevent the use of the cylinder body 1 under different working conditions from affecting the stability of the exhaust assembly 6 and the cover 9, that is, when the exhaust assembly 6 is not in contact with the pressure test connector 5, the fixing strip 11 on the cover 9 can be bolted to the fixing strip 12 on the flange 42. Specifically, after the piston rod length adjustment of the cylinder body 1 is completed, the cylinder cover 61 can be rotated and moved by threaded withdrawal from the flange 41 and the flange 42 until the fixing strip 11 and the fixing strip 12 are aligned. In this application, the cylinder cover 61 can be made transparent so that the fixing strip 11 and the fixing strip 12 can be aligned. At this time, bolts can be used to pass through the fixing strip 11, the cylinder cover 61 and the fixing strip 12 in sequence. This makes the cylinder cover 61 and the cover 9 stable on the cylinder body 1, so as to prevent the cover 9 and the cylinder cover 61 from falling off due to vibration.

Claims

1. A hydraulic cylinder that is easy to assemble, characterized in that: The cylinder body (1) includes a rodless chamber and a rod chamber inside the cylinder body (1). A balance valve body (2) connected to the rodless chamber and the rod chamber is provided on the outside of the cylinder body (1). A pair of exhaust pipes (3) are fixedly connected to the outer surface of the cylinder body (1). The pair of exhaust pipes (3) are respectively connected to the rodless chamber and the rod chamber. An installation assembly (4) is provided on each exhaust pipe (3). A pressure test connector (5) is provided on the installation assembly (4). An exhaust assembly (6) is provided on the outside of the pressure test connector (5). The exhaust assembly (6) is connected to the pressure test connector (5).

2. The hydraulic cylinder for easy assembly according to claim 1, characterized in that: A pair of oil pipes (21) are fixedly connected to the outer surface of the cylinder body (1). The pair of oil pipes (21) are respectively connected to the rodless chamber and the rod chamber, and the pair of oil pipes (21) are respectively connected to the oil inlet and oil outlet of the balance valve body (2).

3. The hydraulic cylinder for easy assembly according to claim 1, characterized in that: The mounting assembly (4) includes a first flange (41), which is fixedly connected to one end of the exhaust pipe (3). The end face of the first flange (41) is bolted to a second flange (42), and one end of the pressure testing connector (5) is fixedly connected to the end face of the second flange (42).

4. A hydraulic cylinder for easy assembly according to claim 3, characterized in that: A sealing gasket (13) is provided between flange one (41) and flange two (42).

5. A hydraulic cylinder for easy assembly according to claim 3, characterized in that: The exhaust assembly (6) includes a sleeve (61), which is located on the outside of the pressure test connector (5). A pin (62) is fixedly connected to the inner wall of the sleeve (61). The pin (62) is coaxially corresponding to the pressure test connector (5). The pin (62) is movably connected to the valve core of the pressure test connector (5). An exhaust hole (63) is provided at one end of the sleeve (61).

6. A hydraulic cylinder for easy assembly according to claim 5, characterized in that: The inner wall of the cylindrical cover (61) is provided with an internal thread (7), and the outer surfaces of the first flange (41) and the second flange (42) are provided with external threads (8). The cylindrical cover (61) is threadedly connected to the external thread (8) through the internal thread (7).

7. A hydraulic cylinder for easy assembly according to claim 5, characterized in that: One end of the cylindrical cover (61) is provided with a cap (9), and a rubber plug (10) is fixedly connected to the end face of the cap (9). The rubber plug (10) is inserted into the exhaust hole (63).

8. A hydraulic cylinder for easy assembly according to claim 7, characterized in that: The outer surface of the cover (9) is fixedly connected to a fixing strip (11), and the end face of the flange (42) is fixedly connected to a fixing strip (12). The fixing strip (11) and the fixing strip (12) are connected by bolts, and one end of the bolts penetrates the cylinder cover (61).

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