Energy accumulator liquid filling system and engineering machinery

Abstract

The utility model relates to the field of engineering machinery, and discloses an energy accumulator liquid filling system and engineering machinery, the energy accumulator liquid filling system comprises a hydraulic pump, an energy accumulator, a hydraulic pump unloading oil way, an electromagnetic directional valve, an oil pressure detection device and a control device, the electromagnetic directional valve is respectively connected with the hydraulic pump, the energy accumulator and the hydraulic pump unloading oil way; the electromagnetic reversing valve is provided with a first valve position and a second valve position, and is communicated with the hydraulic pump and the energy accumulator at the first valve position; at the second valve position, the electromagnetic reversing valve is communicated with the hydraulic pump and the hydraulic pump unloading oil way; the oil pressure detection device is used for detecting oil pressure in the energy accumulator, and the control device is in communication connection with the electromagnetic reversing valve and the oil pressure detection device and used for controlling the electromagnetic reversing valve to be switched between the first valve position and the second valve position according to the detection result of the oil pressure detection device. The energy accumulator liquid filling system is low in manufacturing and maintenance cost and low in maintenance difficulty.

Description

Technical Field

[0001] The utility model belongs to the field of engineering machinery, and in particular relates to an accumulator liquid filling system and engineering machinery. Background Art

[0002] In the existing accumulator filling system of engineering machinery, the accumulator is usually connected to a hydraulic pump to transfer the hydraulic oil in the oil tank to the accumulator through the hydraulic pump to realize the filling of the accumulator. The hydraulic pump is also connected to a discharge oil circuit, and a pressure cut-off valve is arranged on the discharge oil circuit. During the filling process, the pressure cut-off valve is in a cut-off state. When the oil pressure in the accumulator reaches the preset upper limit value, the pressure cut-off valve switches to an open state, so that the discharge oil circuit is conducted to discharge the hydraulic pump, thereby stopping the filling of the accumulator. However, the pressure cut-off valve is relatively expensive and not easy to obtain, resulting in high costs for the manufacture and maintenance of the accumulator filling system and greater difficulty in maintenance. Utility Model Content

[0003] In view of the above-mentioned deficiencies or defects in the prior art, the utility model provides an accumulator filling system and engineering machinery, which can effectively reduce the manufacturing and maintenance costs and maintenance difficulty of the existing accumulator filling system of engineering machinery.

[0004] In order to achieve the above object, the utility model provides an accumulator filling system, the accumulator filling system comprising:

[0005] Hydraulic pumps;

[0006] Accumulator;

[0007] Hydraulic pump unloading oil circuit;

[0008] an electromagnetic reversing valve, connected to the hydraulic pump, the accumulator and the hydraulic pump unloading oil circuit respectively, and having a first valve position and a second valve position. When in the first valve position, the electromagnetic reversing valve is connected to the hydraulic pump and the accumulator; when in the second valve position, the electromagnetic reversing valve is connected to the hydraulic pump and the hydraulic pump unloading oil circuit;

[0009] An oil pressure detection device, used for detecting the oil pressure in the accumulator;

[0010] A control device is respectively connected to the electromagnetic reversing valve and the oil pressure detection device for controlling the electromagnetic reversing valve to switch between the first valve position and the second valve position according to the detection result of the oil pressure detection device.

[0011] Optionally, the solenoid reversing valve is a two-position four-way solenoid reversing valve and has a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port is connected to the hydraulic pump, the second oil port is connected to the accumulator, and the third oil port and the fourth oil port are both connected to the hydraulic pump unloading oil circuit. When in the first valve position, the first oil port is connected to the second oil port; when in the second valve position, the first oil port and the second oil port are connected to the third oil port and the fourth oil port respectively.

[0012] Optionally, the electromagnetic reversing valve is connected to the accumulator via a first oil circuit, a one-way flow structure is provided on the first oil circuit, and the one-way flow structure is configured to only allow hydraulic oil to flow from the electromagnetic reversing valve to the accumulator.

[0013] Optionally, the one-way flow structure is a one-way valve.

[0014] Optionally, the oil pressure detection device is arranged in the first oil circuit and is located between the one-way flow structure and the accumulator.

[0015] Optionally, the oil pressure detection device is a pressure sensor.

[0016] Optionally, the electromagnetic reversing valve is connected to the hydraulic pump via a second oil circuit, and the accumulator charging system further comprises a relief valve, the oil inlet of the relief valve is connected to the second oil circuit, and the oil outlet is connected to the hydraulic pump unloading oil circuit.

[0017] Optionally, the electromagnetic reversing valve, the overflow valve, the one-way flow structure and the oil pressure detection device are all integrated on a valve block.

[0018] Optionally, the accumulator charging system further comprises an accumulator unloading oil circuit connected to the accumulator, and an unloading stop valve is provided on the accumulator unloading oil circuit.

[0019] The utility model also provides an engineering machine, which comprises the above-mentioned accumulator filling system.

[0020] Through the above technical scheme, in the accumulator filling system of the utility model, when the oil pressure in the accumulator is lower than the preset lower limit value, the control device controls the electromagnetic reversing valve to switch to the first valve position, the electromagnetic reversing valve connects the hydraulic pump and the accumulator, so that the hydraulic pump can fill the accumulator; when the oil pressure in the accumulator reaches the preset upper limit value, the control device controls the electromagnetic reversing valve to switch to the second valve position, the electromagnetic reversing valve connects the hydraulic pump and the hydraulic pump unloading oil circuit, the hydraulic pump unloading oil circuit unloads the hydraulic pump, and the hydraulic pump unloads and stops the accumulator from continuing to fill the accumulator. In this way, the accumulator can be filled and stopped accurately and timely, ensuring that the oil pressure in the accumulator is maintained in a suitable oil pressure range; and the electromagnetic reversing valve that controls the accumulator filling and the hydraulic pump unloading is a relatively easy-to-obtain and low-cost valve, so that the production and maintenance costs of the accumulator filling system are effectively reduced, the replacement of the electromagnetic reversing valve is relatively convenient, and the maintenance difficulty of the accumulator filling system is reduced.

[0021] Other features and advantages of the present invention will be described in detail in the subsequent specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation to the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural schematic diagram of an accumulator filling system in an embodiment of the utility model, wherein the electromagnetic reversing valve is in a first valve position;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of the accumulator filling system in FIG. 1 , wherein the electromagnetic reversing valve is in the second valve position;

[0025] Figure 3 It is a structural schematic diagram of an accumulator filling system in another embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1Hydraulic pump 2Accumulator

[0028] 3 Hydraulic pump unloading oil circuit 4 Solenoid reversing valve

[0029] 5 Oil pressure detection device 6 One-way flow structure

[0030] 7 First oil circuit 8 Second oil circuit

[0031] 9 overflow valve 10 accumulator unloading oil circuit

[0032] 11 Unloading stop valve Specific embodiments

[0033] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] The utility model firstly provides an accumulator liquid filling system.

[0038] In one embodiment, referring to the attached Figure 1 and attached Figure 2 As shown, the accumulator charging system includes a hydraulic pump 1, an accumulator 2, a hydraulic pump unloading oil circuit 3, an electromagnetic reversing valve 4, an oil pressure detection device 5 and a control device. The electromagnetic reversing valve 4 is connected to the hydraulic pump 1, the accumulator 2 and the hydraulic pump unloading oil circuit 3, respectively, and has a first valve position and a second valve position. In the first valve position, the electromagnetic reversing valve 4 is connected to the hydraulic pump 1 and the accumulator 2; in the second valve position, the electromagnetic reversing valve 4 is connected to the hydraulic pump 1 and the hydraulic pump unloading oil circuit 3. The oil pressure detection device 5 is used to detect the oil pressure in the accumulator 2. The control device is connected to the electromagnetic reversing valve 4 and the oil pressure detection device 5 for communication, respectively, and is used to control the electromagnetic reversing valve 4 to switch between the first valve position and the second valve position according to the detection result of the oil pressure detection device 5.

[0039] In the accumulator filling system of the present embodiment, when the oil pressure in the accumulator 2 is lower than the preset lower limit, the control device controls the electromagnetic reversing valve 4 to switch to the first valve position, the electromagnetic reversing valve 4 connects the hydraulic pump 1 and the accumulator 2, so that the hydraulic pump 1 can fill the accumulator 2; when the oil pressure in the accumulator 2 reaches the preset upper limit, the control device controls the electromagnetic reversing valve 4 to switch to the second valve position, the electromagnetic reversing valve 4 connects the hydraulic pump 1 and the hydraulic pump unloading oil circuit 3, the hydraulic pump unloading oil circuit 3 unloads the hydraulic pump, and the hydraulic pump unloads and stops the accumulator 2 from continuing to fill the accumulator. In this way, the accumulator 2 can be filled and stopped accurately and timely, ensuring that the oil pressure in the accumulator 2 is maintained in a suitable oil pressure range; and the electromagnetic reversing valve 4 that controls the filling of the accumulator 2 and the unloading of the hydraulic pump is a relatively easy-to-obtain and low-cost valve, so that the manufacturing and maintenance costs of the accumulator filling system are effectively reduced, the replacement of the electromagnetic reversing valve is relatively convenient, and the maintenance difficulty of the accumulator filling system is reduced.

[0040] It can be understood that the accumulator 2 has a normal oil pressure range, the upper limit of the oil pressure is P1, and the lower limit of the oil pressure is P2. When the oil pressure detection device 5 detects that the pressure in the accumulator 2 is less than P2, it means that the pressure in the accumulator 2 is low and needs to be filled. When the oil pressure detection device 5 detects that the pressure of the accumulator 2 reaches P1, it means that the accumulator 2 is full and the filling needs to be stopped. In this way, the upper limit of the oil pressure P1 and the lower limit of the oil pressure P2 are set in the control device, and the state of the electromagnetic reversing valve 4 is controlled according to the detection result of the oil pressure detection device 5.

[0041] In actual application, the hydraulic pump 1 and the hydraulic pump unloading oil circuit 3 can both be connected to the hydraulic oil tank. The hydraulic pump 1 takes oil from the hydraulic oil tank to fill the accumulator 2. When the hydraulic pump 1 is unloaded, the hydraulic pump unloading oil circuit 3 can drain the hydraulic oil back to the hydraulic oil tank for reuse.

[0042] In one embodiment, referring to the attached Figure 1 and attached Figure 2 As shown, the electromagnetic reversing valve 4 is a two-position four-way electromagnetic reversing valve 4 and has a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port is connected to the hydraulic pump 1, the second oil port is connected to the accumulator 2, and the third oil port and the fourth oil port are both connected to the hydraulic pump unloading oil circuit 3. In the first valve position, the first oil port is connected to the second oil port, so that the electromagnetic reversing valve 4 can be connected to the hydraulic pump 1 and the accumulator 2; in the second valve position, the first oil port and the second oil port are connected to the third oil port and the fourth oil port respectively. In this way, the electromagnetic reversing valve 4 can be connected to the hydraulic pump 1 and the hydraulic pump unloading oil circuit 3, and the hydraulic oil in the oil circuit between the second oil port and the accumulator 2 can be discharged through the electromagnetic reversing valve 4 and the hydraulic pump unloading oil circuit 3.

[0043] In this embodiment, the electromagnetic reversing valve 4 can be a self-resetting two-position four-way electromagnetic reversing valve, which is configured to switch to the first valve position when the power is off. With this configuration, when the accumulator charging system fails and the electromagnetic reversing valve 4 is in the power-off state, the hydraulic pump 1 can still charge the accumulator 2. In order to avoid excessive oil pressure, the oil circuit between the hydraulic pump 1 and the accumulator 2 can be connected to the overflow valve. When the oil pressure in the accumulator 2 increases and causes the oil pressure in the oil circuit between the hydraulic pump 1 and the accumulator 2 to reach a preset upper limit value, the overflow valve opens to unload the load (the specific arrangement of the overflow valve can refer to the subsequent embodiments).

[0044] Of course, in other embodiments, the electromagnetic reversing valve 4 can also be in other structural forms, for example, refer to the attached Figure 3 As shown, the electromagnetic reversing valve 4 has a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port is connected to the hydraulic pump 1, the second oil port is connected to the accumulator 2, the third oil port is connected to the hydraulic pump unloading oil circuit 3, and the fourth oil port is in a cut-off state. When it is in the first valve position, the first oil port is connected to the second oil port, so that the electromagnetic reversing valve 4 can be connected to the hydraulic pump 1 and the accumulator 2; when it is in the second valve position, the first oil port is connected to the third oil port, so that the electromagnetic reversing valve 4 can be connected to the hydraulic pump 1 and the hydraulic pump unloading oil circuit 3.

[0045] In one embodiment, referring to the attached Figure 1 and attached Figure 2 As shown, the electromagnetic reversing valve 4 is connected to the accumulator 2 through the first oil circuit 7, and a one-way flow structure 6 is provided on the first oil circuit 7. The one-way flow structure 6 is configured to only allow the hydraulic oil to flow from the electromagnetic reversing valve 4 to the accumulator 2. This configuration can prevent the hydraulic oil in the accumulator 2 from flowing back to the electromagnetic reversing valve 4, thereby maintaining the oil pressure in the accumulator 2.

[0046] In one embodiment, referring to the attached Figure 1 and attached Figure 2 As shown, the one-way flow structure 6 is a one-way valve.

[0047] In one embodiment, referring to the attached Figure 1 and attached Figure 2 As shown, the oil pressure detection device 5 is disposed on the first oil passage 7 and between the one-way flow structure 6 and the accumulator 2. In some other embodiments, the oil pressure detection device 5 may also be directly disposed in the accumulator 2.

[0048] In one embodiment, the oil pressure detection device 5 is a pressure sensor. Figure 3 As shown, the oil pressure detection device 5 can also be a pressure switch.

[0049] In one embodiment, referring to the attached Figure 1 and attached Figure 2As shown, the electromagnetic reversing valve 4 is connected to the hydraulic pump 1 through the second oil circuit 8, and the accumulator charging system also includes a relief valve 9, the oil inlet of the relief valve 9 is connected to the second oil circuit 8, and the oil outlet is connected to the hydraulic pump unloading oil circuit 3.

[0050] In this embodiment, when the oil pressure in the accumulator 2 increases and causes the oil pressure in the second oil circuit 8 to reach the opening oil pressure value P3 of the relief valve 9, the relief valve 9 opens to unload, wherein the opening oil pressure value P3 is generally set to be 2 to 3 MPa higher than the oil pressure upper limit value P1 of the accumulator 2.

[0051] The overflow valve 9 functions as a safety valve, and can keep the hydraulic oil pressure output by the hydraulic pump 1 constant.

[0052] In one embodiment, the electromagnetic reversing valve 4, the overflow valve 9, the one-way flow structure 6 and the oil pressure detection device 5 are all integrated on a valve block, so as to improve the compactness and integration of the accumulator filling system structure.

[0053] In one embodiment, referring to the attached Figure 1 and attached Figure 2 As shown, the accumulator charging system also includes an accumulator unloading oil circuit 10 connected to the accumulator 2, and an unloading stop valve 11 is arranged on the accumulator unloading oil circuit 10. In this way, the operator can realize manual unloading of the accumulator 2 by manipulating the opening and closing of the unloading stop valve 11.

[0054] In actual application, the accumulator unloading oil circuit 10 is connected to the hydraulic oil tank, so that the hydraulic oil generated by manual unloading of the accumulator 2 can flow back to the hydraulic oil tank for reuse.

[0055] The utility model also provides an engineering machine, the engineering machine comprising the accumulator filling system as described above. The specific structure of the accumulator filling system refers to the above embodiment. Since the engineering machine adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0056] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An accumulator filling system, characterized in that: The accumulator filling system comprises: Hydraulic pump (1); Accumulator (2); Hydraulic pump unloading oil circuit (3); an electromagnetic reversing valve (4) connected to the hydraulic pump (1), the accumulator (2) and the hydraulic pump unloading oil circuit (3) respectively, and having a first valve position and a second valve position. When the electromagnetic reversing valve (4) is in the first valve position, the hydraulic pump (1) and the accumulator (2) are connected; when the electromagnetic reversing valve (4) is in the second valve position, the hydraulic pump (1) and the hydraulic pump unloading oil circuit (3) are connected; An oil pressure detection device (5) for detecting the oil pressure in the accumulator (2); A control device is respectively connected to the electromagnetic reversing valve (4) and the oil pressure detection device (5) for controlling the electromagnetic reversing valve (4) to switch between the first valve position and the second valve position according to the detection result of the oil pressure detection device (5).

2. The accumulator filling system according to claim 1, characterized in that: The electromagnetic reversing valve (4) is a two-position four-way electromagnetic reversing valve (4) and has a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port is connected to the hydraulic pump (1), the second oil port is connected to the accumulator (2), the third oil port and the fourth oil port are both connected to the hydraulic pump unloading oil circuit (3), in the first valve position, the first oil port is connected to the second oil port, in the second valve position, the first oil port and the second oil port are connected to the third oil port and the fourth oil port respectively.

3. The accumulator filling system according to claim 1, characterized in that: The electromagnetic reversing valve (4) is connected to the accumulator (2) via a first oil circuit (7); a one-way flow structure (6) is provided on the first oil circuit (7); the one-way flow structure (6) is configured to only allow hydraulic oil to flow from the electromagnetic reversing valve (4) to the accumulator (2).

4. The accumulator charging system according to claim 3, characterized in that: The one-way flow structure (6) is a one-way valve.

5. The accumulator charging system according to claim 3, characterized in that: The oil pressure detection device (5) is arranged on the first oil circuit (7) and is located between the one-way flow structure (6) and the accumulator (2).

6. The accumulator charging system according to claim 5, characterized in that: The oil pressure detection device (5) is a pressure sensor.

7. The accumulator charging system according to claim 5, characterized in that: The electromagnetic reversing valve (4) is connected to the hydraulic pump (1) via a second oil circuit (8); the accumulator charging system further comprises a relief valve (9); an oil inlet of the relief valve (9) is connected to the second oil circuit (8), and an oil outlet is connected to the hydraulic pump unloading oil circuit (3).

8. The accumulator charging system according to claim 7, characterized in that: The electromagnetic reversing valve (4), the overflow valve (9), the one-way flow structure (6) and the oil pressure detection device (5) are all integrated on a valve block.

9. The accumulator charging system according to claim 1, characterized in that: The accumulator filling system further comprises an accumulator unloading oil circuit (10) connected to the accumulator (2), and an unloading stop valve (11) is arranged on the accumulator unloading oil circuit (10).

10. An engineering machine, characterized in that: The construction machine comprises an accumulator charging system according to any one of claims 1 to 9.

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