Hydraulic auxiliary device and hydraulic system

Abstract

The utility model discloses a hydraulic auxiliary device and a hydraulic system. The hydraulic auxiliary device comprises a cylinder body and a cylinder bottom, the first end of the cylinder body is provided with a first hole communicated with a first inner cavity of an oil cylinder of an oil cylinder assembly in the hydraulic system, the second end of the cylinder body is connected with the cylinder bottom, and the waist of the cylinder body is provided with a plurality of fluid holes capable of communicating the inside and the outside of the cylinder body; a plug, a reset spring and a piston are arranged in the cylinder body, and an oil inlet hole used for injecting hydraulic oil to push the piston is formed in the cylinder bottom. The piston is connected with the plug; in a normal state, the plug is in a state of closing a fluid passage between the first hole and the fluid hole, during working, the plug is pushed to be opened by the piston, the fluid passage between the first hole and the fluid hole is communicated, the reset spring is compressed, and when working is finished, the reset spring elastically resets to push the piston to contract. And the plug moves and restores to a state of closing the fluid passage in a normal state. According to the utility model, the extension and retraction speed of the piston rod in the hydraulic system can be improved, and the working efficiency of execution components is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulics, in particular to a hydraulic auxiliary device and a hydraulic system. Background Art

[0002] The hydraulic system controls the injection or discharge of hydraulic oil in the hydraulic cylinder to push the piston rod to move back and forth in a straight line, thereby achieving a linear and stable transmission of power.

[0003] Figure 1 It is a structural diagram of the oil cylinder assembly used for the crimping machine in the prior art, as shown in FIG. Figure 1 As shown, the oil cylinder assembly 100 for the crimping machine, when performing the crimping operation, hydraulic oil is injected into the first inner chamber 104 of the oil cylinder from the oil filling hole 102 at the bottom of the oil cylinder 109 to push the piston rod 103 to extend to complete the crimping action on the pipe fitting. After the crimping is completed, hydraulic oil is injected into the second inner chamber 107 from the oil filling hole 101 at the top of the oil cylinder to push the piston rod back to achieve pressure relief and complete the release and removal of the crimped part. The inventor found that when this hydraulic system is crimping, its piston rod extends slowly and requires a large amount of power to achieve the piston rod extending to the predetermined position. When the crimping is completed and the workpiece is released, the piston rod also takes a long time to retract into its original position, resulting in low working efficiency of the crimping machine. Utility Model Content

[0004] The utility model provides a hydraulic auxiliary device and a hydraulic system, which can solve the above-mentioned technical problems and can increase the extension and retraction speed of the piston rod in the hydraulic system of the crimping machine, thereby improving the working efficiency of the crimping machine.

[0005] The utility model provides a hydraulic auxiliary device, comprising: a cylinder body and a cylinder bottom, wherein the first end of the cylinder body is provided with a first hole connected to the first inner cavity of the oil cylinder of the oil cylinder assembly in the hydraulic system, the second end is connected to the cylinder bottom, and the waist of the cylinder body is provided with a plurality of fluid holes that can connect the inside and outside of the cylinder body; a plug, a return spring and a piston are provided in the cylinder body, and the cylinder bottom is provided with an oil inlet hole for injecting hydraulic oil to push the piston; the piston is connected to the plug; under normal circumstances, the plug is in a state of closing the fluid passage between the first hole and the fluid hole, when working, the plug is pushed open by the piston, the fluid passage between the first hole and the fluid hole is opened, and the return spring is compressed. When the work is completed, the return spring elastically resets and pushes the piston to contract, so that the plug moves back to the state of closing the fluid passage under normal circumstances.

[0006] In one embodiment, the hydraulic auxiliary device further includes: a support frame having a plurality of through holes, installed in the cylinder body, and used to support the linear movement of the guide plug.

[0007] In one embodiment, in the above hydraulic auxiliary device, the plug includes a bottom with a larger cross-section and a rod with a smaller cross-section, one end of the rod is connected to the piston, and the bottom with a larger cross-section is used to close or open the fluid passage between the first hole and the fluid hole.

[0008] The utility model also provides a hydraulic system, including a cylinder assembly and the above-mentioned hydraulic auxiliary device, the cylinder assembly is provided with a first inner cavity and a second inner cavity separated by the bottom of the piston rod, when hydraulic oil is injected into the first inner cavity, the piston rod pushes the actuator to work, and when hydraulic oil is injected into the second inner cavity, the piston rod retracts and releases pressure; the bottom of the cylinder of the cylinder assembly is provided with a second hole connected to the first inner cavity, after the bottom of the cylinder of the cylinder assembly is connected to the hydraulic auxiliary device, the first hole of the hydraulic auxiliary device is connected to the second hole of the cylinder assembly.

[0009] In one embodiment, a third inner cavity is defined at the center of the bottom of the piston rod of the cylinder assembly. A third piston is located within the third inner cavity and is fixedly connected to the bottom of the cylinder. The third piston has a passage for injecting hydraulic oil into the third inner cavity. The cross-sectional area of the third inner cavity is smaller than that of the first inner cavity. Optionally, the cross-sectional area of the second inner cavity is equal to that of the third inner cavity, and the cross-sectional area of the first inner cavity is several times that of the third inner cavity.

[0010] In one embodiment, a third hole is provided at the bottom of the oil cylinder of the oil cylinder assembly, and the third hole is connected to the first inner cavity. Optionally, the third hole is connected to the first inner cavity through a one-way valve.

[0011] In one embodiment, the hydraulic system further includes: a hollow connecting piece for connecting the hydraulic auxiliary device and the cylinder assembly so that the first hole and the second hole are in communication.

[0012] The embodiment of the utility model uses a hydraulic auxiliary device to perform self-priming or pressure relief of a large flow of hydraulic oil, so that the piston rod of the hydraulic system can be quickly extended or retracted, thereby improving the working efficiency of the executing parts such as the crimping machine; at the same time, since the hydraulic oil in the first inner cavity is self-priming, the external power requirement can be reduced, thereby having a better energy-saving effect; the hollow connecting piece allows the use of the hydraulic auxiliary device even when space is limited; by precisely controlling the opening and closing of each oil filling port, the stable power output of the hydraulic system can be effectively improved, thereby improving the accuracy of the processed product; the hydraulic auxiliary device can be prepared, installed and disassembled separately, has a simple structure, is easy to maintain, and has a good energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0014] Figure 1 It is a structural schematic diagram of the oil cylinder assembly used in the crimping machine in the prior art;

[0015] Figure 2 A structural diagram of a hydraulic system provided in an embodiment of the present utility model;

[0016] Figure 3 A schematic structural diagram of another hydraulic system provided in an embodiment of the present utility model;

[0017] Figure 4 It is a structural diagram of the hydraulic auxiliary device (plug closure);

[0018] Figure 5 This is a schematic diagram of the structure of the hydraulic auxiliary device (plug open);

[0019] Figure 6 It is a structural diagram of the cylinder in the hydraulic auxiliary device;

[0020] Figure 7 This is a schematic diagram of the structure of the hollow connector used to connect the cylinder assembly and the hydraulic auxiliary device. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In order to make the technical solution of the present invention clearer, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] Figure 2 A structural diagram of a hydraulic system provided in an embodiment of the present utility model is shown in FIG. Figure 3 This is a structural diagram of another hydraulic system provided by an embodiment of the present utility model. Figure 4 This is a structural diagram of the hydraulic auxiliary device (plug closure). Figure 5This is a structural diagram of the hydraulic auxiliary device (plug open). Figure 6 It is a structural diagram of the cylinder in the hydraulic auxiliary device. Figure 7 The schematic diagram of the structure of the hollow connector used to connect the cylinder assembly and the hydraulic auxiliary device is as follows: Figure 2-7 As shown, the hydraulic system of this embodiment includes a cylinder assembly 100 and a hydraulic auxiliary device 200. The cylinder assembly is provided with a first inner cavity 104 and a second inner cavity 107 divided by the bottom of the piston rod 103. When hydraulic oil is injected into the first inner cavity, the piston rod pushes the actuator (not shown) to work. When hydraulic oil is injected into the second inner cavity, the piston rod retracts and releases pressure. The bottom of the cylinder of the cylinder assembly is provided with a second hole 113 connected to the first inner cavity. After the bottom of the cylinder of the cylinder assembly is connected to the hydraulic auxiliary device, the first hole 11 of the hydraulic auxiliary device is connected to the second hole 113 of the cylinder assembly.

[0024] Compared with the existing technology, the hydraulic system in this embodiment is equipped with a hydraulic auxiliary device to achieve self-priming and discharge of large-flow hydraulic oil, so that the piston rod of the cylinder assembly can be quickly extended or retracted. The self-priming of the hydraulic oil improves the working efficiency by several times with the same rated fluid, and has a better energy-saving effect. The hydraulic auxiliary device in the embodiment of the present utility model includes: a cylinder body 10 and a cylinder bottom 20, the first end of the cylinder body is provided with a first hole 11 connected to the first inner cavity of the cylinder of the cylinder assembly in the hydraulic system, the second end is connected to the cylinder bottom 20, and the waist of the cylinder body is provided with a plurality of fluid holes 12 that can connect the inside and outside of the cylinder body; a plug 30, a return spring 40 and a piston 50 are provided in the cylinder body, and an oil inlet hole 21 for injecting hydraulic oil to push the piston is provided at the bottom of the cylinder; the piston 50 is connected to the plug 30; under normal circumstances, the plug 30 is in a state of closing the fluid passage 15 between the first hole 11 and the fluid hole 12. When working, the plug is pushed open by the piston, the fluid passage 15 between the first hole and the fluid hole is connected, and the return spring is compressed. At the end of the work, the return spring elastically resets and pushes the piston to contract, so that the plug moves back to the state of closing the fluid passage under normal circumstances.

[0025] In practical applications, to ensure that the plug 30 can move stably and linearly, a guiding structure can be provided within the cylinder body. This guiding structure can be a separate component or an integral part of the cylinder body's internal structure. In this embodiment, the guiding structure is designed to be independent of the cylinder body. Specifically, the hydraulic assist device further includes a support frame 70 having multiple through-holes, which is mounted within the cylinder body 10 and is used to support and guide the linear movement of the plug 30.

[0026] To enable the plug to close or open the fluid passage 15, the plug 30 in the above embodiment includes a base portion with a larger cross-section and a stem portion with a smaller cross-section, one end of which is connected to the piston 50. In practice, the base portion with the larger cross-section has a wedge-shaped or tapered surface to facilitate fluid flow when the passage is opened and to provide a good seal when closed.

[0027] The hydraulic auxiliary device of the above structure can control the plug to open the oil passage between the oil tank and the first inner cavity of the cylinder assembly by opening the oil inlet hole at the bottom of the cylinder, so that a large amount of hydraulic oil in the oil tank can enter the first inner cavity or the hydraulic oil in the first inner cavity can be quickly discharged into the oil tank, thereby realizing rapid extension or retraction of the piston rod of the cylinder assembly.

[0028] In specific applications, when the space below the cylinder assembly is limited, it is difficult to directly install the hydraulic auxiliary device on the bottom of the cylinder assembly. Therefore, the embodiment of the present invention also provides a method for connecting the hydraulic auxiliary device placed at a distance to the cylinder assembly through a connecting piece to achieve the same function, such as Figure 3 As shown. That is, in other embodiments, the hydraulic system may further include: a hollow connecting member 60. Figure 7 As shown, the hollow connector 60 is used to connect the hydraulic auxiliary device and the cylinder assembly, and the first hole and the second hole can also be connected through the hollow connector. Figure 3 As shown, when the distance is far, the hollow connector can be connected by adding an oil pipe 61, so that the hydraulic system has a wider range of use.

[0029] The cylinder body of the hydraulic assist device 200 can be directly connected to the bottom of the cylinder assembly by bolts, or it can be connected to the cylinder assembly by a hollow connector. Therefore, a bolt hole 13 is provided at the cylinder body connection part; in order to ensure a firm connection between the cylinder bottom and the cylinder body, a threaded hole 17 is also provided on the cylinder body for connecting the cylinder bottom and the cylinder body using a connecting screw.

[0030] In practical applications, in order to enable the piston rod to quickly extend to a preset position when the hydraulic system starts working, in the embodiment of the present utility model, Figure 2 and Figure 3 As shown, a third inner cavity 105 is also provided at the bottom center of the piston rod 103 of the cylinder assembly. A third piston 120 is fixedly connected to the bottom of the cylinder of the cylinder assembly within the third inner cavity. The third piston has a channel 110 for injecting hydraulic oil into the third inner cavity. The cross-sectional area of the third inner cavity is smaller than that of the first inner cavity. When the cross-section is circular, the diameter d of the third inner cavity is smaller than the diameter D of the first inner cavity. Because the cross-sectional area of the third inner cavity is smaller, injecting the same volume of hydraulic oil into the third inner cavity can enable the piston rod to move a greater distance compared to the first inner cavity. Therefore, the piston rod of the cylinder assembly can be extended quickly, thereby improving the working efficiency of the actuator, such as a crimping machine, and reducing power requirements. In specific applications, the cross-sectional area of the second inner cavity can be made equal to the cross-sectional area of the third inner cavity, which improves working efficiency and energy saving. The cross-sectional area of the first inner cavity is several times that of the third inner cavity.

[0031] In actual applications, such as when a crimping machine is crimping a pipe fitting, the piston rod of the cylinder assembly does not apply pressure to the pipe fitting before it is extended to the preset position, and the piston rod can be extended quickly. When it reaches the preset position and starts to apply pressure to the pipe fitting, it is necessary to apply force slowly and steadily to improve the processing quality of the processed pipe fitting. Therefore, in the hydraulic system in the embodiment of the present invention, the piston rod is quickly extended to the preset position, and then slowly applies pressure to the actuator after reaching the preset position, which can ensure the product quality of the processed component. To this end, a third hole 102 is provided at the bottom of the cylinder of the cylinder assembly, and the third hole is connected to the first inner cavity 104. When the piston rod moves quickly to the preset position, the third inner cavity 105 in the piston rod is stopped or a small amount of hydraulic oil is injected into the third inner cavity 105, and hydraulic oil is injected into the first inner cavity 104 through the third hole 102, so that the piston rod 103 can move slowly and output power stably. The third hole can be an opening hole for injecting hydraulic oil into the third inner cavity (such as Figure 3 The third hole 102 shown in FIG. 1 may also be a single opening hole (such as Figure 2 When the third hole 102 and the opening for injecting hydraulic oil into the third inner cavity are the same oil injection hole, the oil injection channel 110 includes two parts, one part of the channel 112 is located in the third piston, and the other part of the channel 111 is located at the bottom of the cylinder assembly. The hydraulic oil enters the third inner cavity through the third hole 102, the channel 111 and the channel 112. Figure 3 As shown, a one-way valve 108 is provided on the channel between the oil injection channel of the third inner cavity and the first inner cavity, through which hydraulic oil can be injected into the first inner cavity 104. When the third hole 102 is a separate opening hole, the opening hole 106 for injecting hydraulic oil into the third inner cavity can be directly set at the center of the bottom of the cylinder of the cylinder assembly, and the hydraulic oil enters the third inner cavity through the opening hole 106 and the oil injection channel 110, as shown in FIG. Figure 2 shown.

[0032] The third hole 102 is provided independently or in common with the oil filling hole of the third inner cavity. Figure 2 and Figure 3 The embodiments shown are interchangeable.

[0033] When the above hydraulic system is working, the following control method is used to achieve rapid extension or retraction of the piston rod in the hydraulic system.

[0034] The hydraulic system control method in the embodiment of the present utility model includes:

[0035] Step 1: Hydraulic oil is injected into the fourth inner cavity 22 formed by the cylinder bottom, cylinder body and piston through the oil inlet hole 21 at the bottom of the cylinder in the hydraulic auxiliary device 200. The hydraulic oil pushes the piston 50 to open the plug 30. At the same time, hydraulic oil is injected into the third inner cavity 105. When the piston rod of the cylinder assembly moves to the preset position and there is no negative pressure in the first inner cavity 104, the oil inlet hole 21 at the bottom of the cylinder in the hydraulic auxiliary device is stopped. Oil injection into the third inner cavity 105 can be done as follows: Figure 2 The injection hole 106 shown can also be Figure 3 The third hole 102 is shown.

[0036] In this step, after oil is injected into the third inner cavity 105, the piston rod moves out quickly, causing a negative pressure to form in the first inner cavity 104. Since the plug has been opened, a large amount of hydraulic oil is sucked into the first inner cavity 104 from the oil tank through multiple fluid holes 12, the fluid passage 15 in the cylinder body, the first hole 11 and the second hole 113 under the action of negative pressure. As a large amount of hydraulic oil is injected, the fluid gradually fills the first inner cavity and the negative pressure gradually disappears. If hydraulic oil is continued to be injected into the first inner cavity, pressure is applied to the piston rod to enable the actuator, such as a crimping machine, to perform the pipe crimping operation. Since the specific execution of the actuator requires stable pressure, oil is injected through a more controllable hydraulic oil injection port. Therefore, it is necessary to stop the oil inlet hole 21 of the hydraulic auxiliary device to allow the plug to reset under the elastic force of the reset spring, so that the plug closes the fluid passage 15.

[0037] Step 2: inject hydraulic oil into the first inner cavity 104 through the third hole 102 to make the piston rod push the actuator to work.

[0038] Step three, when the execution component finishes working, hydraulic oil is injected into the fourth inner cavity 22 through the oil inlet hole 21 at the bottom of the cylinder in the hydraulic auxiliary device, and the hydraulic oil pushes the piston to open the plug; at the same time, hydraulic oil is injected into the second inner cavity 107 of the cylinder assembly to push the piston rod to retract. When the piston rod retracts to the position in the non-working state, the oil supply to the oil inlet hole 21 at the bottom of the cylinder in the hydraulic auxiliary device and the oil injection hole 101 of the second inner cavity are stopped.

[0039] The above steps 1 to 3 can be performed once. For continuous operation, steps 1 to 3 can be repeated. In actual operation, the hydraulic assist device can be directly immersed in the oil tank. When the plug is opened, hydraulic oil is injected into the third inner chamber, pushing the piston rod to move, creating a negative pressure in the first inner chamber. The hydraulic oil can then enter the first inner chamber through fluid hole 12 and fluid passage 15 to compensate for the negative pressure. This hydraulic system has a self-priming function, thus saving external power. When the operation is completed, the hydraulic oil in the first inner chamber is depressurized through fluid hole 12 through the fluid passage.

[0040] The embodiment of the utility model uses a hydraulic auxiliary device to perform self-priming or pressure relief of a large flow of hydraulic oil, so that the piston rod of the hydraulic system can be quickly extended or retracted, thereby improving the working efficiency of the executing components such as the crimping machine; at the same time, due to the self-priming of the hydraulic oil in the first inner cavity, the external power requirement can be reduced, thereby having a better energy-saving effect; the hollow connecting piece allows the use of the hydraulic auxiliary device even when space is limited; by precisely controlling the opening and closing of each oil filling port, the stable power output of the hydraulic system can be effectively improved, thereby improving the accuracy of the processed product; the hydraulic auxiliary device can be prepared, installed and disassembled separately, has a simple structure, is easy to maintain, and has a good energy-saving effect.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic assist device, characterized in that: include: The cylinder body and the cylinder bottom, the first end of the cylinder body is provided with a first hole connected to the first inner cavity of the oil cylinder of the oil cylinder assembly in the hydraulic system, the second end is connected to the cylinder bottom, and the waist of the cylinder body is provided with a plurality of fluid holes that can connect the inside and outside of the cylinder body; a plug, a return spring and a piston are provided in the cylinder body, and an oil inlet hole for injecting hydraulic oil to push the piston is provided at the bottom of the cylinder; the piston is connected to the plug; under normal circumstances, the plug is in a state of closing the fluid passage between the first hole and the fluid hole. When working, the plug is pushed open by the piston, the fluid passage between the first hole and the fluid hole is opened, and the return spring is compressed. At the end of the work, the return spring elastically resets and pushes the piston to contract, so that the plug moves back to the state of closing the fluid passage under normal circumstances.

2. The device according to claim 1, characterized in that Also includes: A support frame with multiple through holes is installed in the cylinder body and is used to support the linear movement of the guide plug.

3. The device according to claim 1 or 2, characterized in that The plug includes a bottom with a larger cross-section and a rod with a smaller cross-section. One end of the rod is connected to the piston. The bottom with a larger cross-section is used to close or open the fluid passage between the first hole and the fluid hole.

4. A hydraulic system, characterized in that: It comprises a cylinder assembly and a hydraulic assist device as described in any one of claims 1 to 3, wherein the cylinder assembly is provided with a first inner cavity and a second inner cavity separated by the bottom of a piston rod, and when hydraulic oil is injected into the first inner cavity, the piston rod pushes the actuator to work, and when hydraulic oil is injected into the second inner cavity, the piston rod retracts and releases pressure; the bottom of the cylinder of the cylinder assembly is provided with a second hole communicating with the first inner cavity, and after the bottom of the cylinder of the cylinder assembly is connected to the hydraulic assist device, the first hole of the hydraulic assist device is communicated with the second hole of the cylinder assembly.

5. The system according to claim 4, characterized in that A third inner cavity is provided at the center of the bottom of the piston rod of the cylinder assembly, and a third piston is provided in the third inner cavity and is fixedly connected to the bottom of the cylinder. The third piston has a channel for injecting hydraulic oil into the third inner cavity, and the cross-sectional area of the third inner cavity is smaller than that of the first inner cavity.

6. The system according to claim 5, characterized in that The cross-sectional area of the second inner cavity is equal to the cross-sectional area of the third inner cavity, and the cross-sectional area of the first inner cavity is several times the cross-sectional area of the third inner cavity.

7. The system according to any one of claims 4 to 6, characterized in that A third hole is provided at the bottom of the oil cylinder of the oil cylinder assembly, and the third hole is communicated with the first inner cavity.

8. The system according to claim 7, characterized in that The third hole is communicated with the first inner cavity through a one-way valve.

9. The system according to claim 4, wherein: Also includes: The hollow connecting piece is used to connect the hydraulic auxiliary device and the oil cylinder assembly so that the first hole and the second hole are in communication.

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