Bucket wheel machine arm support pitching oil cylinder protection valve block and hydraulic system
By integrating a parallel balance valve, overflow valve, and pressure sensor into the protection valve block of the boom pitch cylinder of the bucket wheel excavator, the problems of slow response speed, poor anti-interference, poor pressure relief stability, and complex maintenance in the existing technology have been solved, realizing a hydraulic system with fast response, intelligent adjustment, and low cost.
Patent Information
- Application Number
- CN202422756610.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-12
AI Technical Summary
The existing bucket wheel excavator boom pitch cylinder protection valve block has a slow response speed, poor anti-interference, lack of intelligent adjustment function, poor pressure relief stability, complex and costly maintenance, is prone to leakage, and has a low degree of modularity.
Design a hydraulic system that includes a first and second balance valve connected in parallel, an overflow valve group, a check valve, and a pressure sensor, integrated in the rodless chamber of the cylinder. By controlling the inlet and outlet flow and pressure of the cylinder, ensure the stability and safety of the boom pitching motion.
It achieves rapid response, strong anti-interference, intelligent adjustment function, good pressure relief stability, simple maintenance and low cost, reduces leakage risk and improves modularity.
Smart Images
Figure CN223511214U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic valve block technology, and in particular to a protective valve block for the boom pitching cylinder of a bucket wheel excavator. Background Technology
[0002] The protective valve block for the boom pitch cylinder of a bucket wheel excavator is a hydraulic component specifically designed to protect the boom pitch cylinder. Its main function is to prevent boom loss of control or damage during boom pitching operations due to hydraulic system malfunctions or sudden pressure changes. It typically consists of components such as an explosion-proof valve, a safety relief valve, a two-way balance valve, a locking valve, and a throttle valve. These components together form an integrated hydraulic protection system that ensures the stability and safety of boom pitching movements by controlling the inlet and outlet oil flow and pressure of the cylinder. Existing protective valve blocks for the boom pitch cylinder of bucket wheel excavators have some drawbacks in practical applications, mainly including slow response speed, poor anti-interference capability, lack of intelligent adjustment function, poor pressure relief stability, complex and costly maintenance, susceptibility to leakage, and low modularity. Utility Model Content
[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.
[0004] In view of the problems existing in the above and / or existing bucket wheel excavator boom pitch cylinder protection valve block, this utility model is proposed.
[0005] Therefore, the problem that this utility model aims to solve lies in the existing protective valve block.
[0006] To solve the above-mentioned technical problems, in a first aspect, this utility model provides the following technical solution: a protective valve block for the boom pitching cylinder of a bucket wheel excavator, comprising: a first balance valve and a second balance valve connected in parallel; one end of the first balance valve is connected to an oil outlet, and the other end is connected to the rod chamber of the cylinder; one end of the second balance valve is connected to an oil outlet, and the other end is connected to the rodless chamber of the cylinder; a first shut-off valve disposed on the pipeline between the first balance valve and the rod chamber; a second shut-off valve disposed on the pipeline between the second balance valve and the rodless chamber; and an overflow valve assembly disposed between the first shut-off valve and the second shut-off valve.
[0007] As a preferred embodiment of the bucket wheel excavator boom pitch cylinder protection valve block of this utility model, wherein: the first balance valve and the second balance valve are interconnected and both are connected to the second leakage return port.
[0008] As a preferred embodiment of the bucket wheel excavator boom pitch cylinder protection valve block of this utility model, the overflow valve group includes a first overflow valve and a second overflow valve connected in series, and both are connected to the first leakage return port.
[0009] As a preferred embodiment of the bucket wheel excavator boom pitch cylinder protection valve block of the present invention, it further includes a first unloading valve and a second unloading valve connected in parallel with the overflow valve group. The first unloading valve and the second unloading valve are connected in series with each other and are both connected to the first leakage return port.
[0010] As a preferred embodiment of the bucket wheel excavator boom pitch cylinder protection valve block of this utility model, it further includes a first check valve and a second check valve. The outlet of the first check valve is connected to the first shut-off valve, and the outlet of the second check valve is connected to the second shut-off valve. The inlets of the first check valve and the second check valve are interconnected and both are connected to the first leakage return port.
[0011] As a preferred embodiment of the bucket wheel excavator boom pitch cylinder protection valve block of this utility model, it further includes a first inter-shut valve and a second inter-shut valve. One end of the first inter-shut valve is connected to the first inter-switching port, and the other end is connected to the outlet of the first one-way valve. One end of the second inter-shut valve is connected to the second inter-switching port, and the other end is connected to the outlet of the second one-way valve.
[0012] In a preferred embodiment of the bucket wheel excavator boom pitch cylinder protection valve block of this utility model, the first leakage return port and the second leakage return port are interconnected.
[0013] In a preferred embodiment of the bucket wheel excavator boom pitch cylinder protection valve block of this utility model, the protection valve block is integrally installed in the rodless chamber of the cylinder.
[0014] On the other hand, this utility model also provides a hydraulic system, which includes the above-mentioned bucket wheel excavator boom pitch cylinder protection valve block, and also includes a first pressure sensor and a second pressure sensor. The mounting port of the first pressure sensor is connected to the first unloading valve; the mounting port of the second pressure sensor is connected to the second unloading valve.
[0015] As a preferred embodiment of the bucket wheel excavator boom pitch cylinder protection valve block of this utility model, there are two cylinders, namely a first cylinder and a second cylinder, both of which are equipped with the protection valve block.
[0016] The beneficial effects of this utility model are as follows: The integrated block design of this utility model has a compact structure, and the valve block is arranged on the mounting surface of the rodless chamber of the oil cylinder, avoiding problems caused by the failure of the intermediate connecting pipeline; the pressure-holding hydraulic element is set on the oil cylinder, avoiding the long-term high-pressure state of the pipeline between the hydraulic station and the oil cylinder, which greatly improves the protection against pipeline leakage and system failure; the configuration of relief valve, check valve and other protective components prevents damage and cavitation caused by overpressure and cavitation during the operation of the oil cylinder; the configuration of unloading throttle valve greatly reduces the convenience of maintenance operations, eliminating the need for a separate support frame to maintain the position of the oil cylinder; and the configuration of sufficient pressure measuring points facilitates fault diagnosis. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:
[0018] Figure 1 This is a schematic diagram of the protective valve block for the boom tilting cylinder of a bucket wheel excavator. Detailed Implementation
[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0021] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.
[0022] Example 1
[0023] Reference Figure 1 This is the first embodiment of the present utility model. This embodiment provides a protective valve block for the boom pitch cylinder of a bucket wheel excavator. The protective valve block for the boom pitch cylinder of a bucket wheel excavator includes a first balance valve 101, a second balance valve 102, a first stop valve 201, a second stop valve 202, and an overflow valve group 300.
[0024] Specifically, the first balancing valve 101 and the second balancing valve 102 are connected in parallel. One end of the first balancing valve 101 is connected to the oil inlet V1, and the other end is connected to the rod-side chamber Y of the cylinder. One end of the second balancing valve 102 is connected to the oil outlet V2, and the other end is connected to the rodless chamber W of the cylinder. The control ports of the first balancing valve 101 and the second balancing valve 102 are connected, and both are connected to the second leakage return port T2 through pipelines.
[0025] Specifically, a first shut-off valve 201 is also provided on the pipeline connecting the first balancing valve 101 to the rod chamber Y, and a second shut-off valve 202 is also provided on the pipeline connecting the second balancing valve 102 to the rodless chamber W.
[0026] A relief valve assembly 300 is also connected between the first shut-off valve 201 and the second shut-off valve 202. The relief valve assembly 300 includes a first relief valve 301 and a second relief valve 302 connected in series. A pipe is also connected at the intermediate position between the first relief valve 301 and the second relief valve 302, and this pipe is connected to the first leakage return port T1.
[0027] Example 2
[0028] Reference Figure 1 This is the second embodiment of the present invention, which is based on the previous embodiment. This embodiment also provides a first unloading valve 401, a second unloading valve 402, a first check valve 501, a second check valve 502, a first inter-shutdown valve 601, and a second inter-shutdown valve 602.
[0029] Specifically, the first unloading valve 401 and the second unloading valve 402 are connected in series, and one end of the first unloading valve 401 is connected to the pipeline between the first balancing valve 101 and the first shut-off valve 201. One end of the second unloading valve 402 is connected to the pipeline between the second balancing valve 102 and the second shut-off valve 201. The connection point between the first unloading valve 401 and the second unloading valve 402 is connected to the first leakage return port T1.
[0030] Preferably, the outlet of the first check valve 501 is connected to the pipeline between the first balancing valve 101 and the first shut-off valve 201. The outlet of the second check valve 502 is connected to the pipeline between the second balancing valve 102 and the second shut-off valve 201. The inlet of the first check valve 501 and the inlet of the second check valve 502 are connected, and the connection point is connected to the first leakage return port T1.
[0031] Furthermore, one end of the first inter-shutdown valve 601 is connected to the first inter-port V11, and the other end is connected to the pipeline between the first balance valve 101 and the first shut-off valve 201. One end of the second inter-shutdown valve 602 is connected to the second inter-port V12, and the other end is connected to the pipeline between the second balance valve 102 and the second shut-off valve 201.
[0032] Furthermore, the first leakage return port T1 is interconnected with the second leakage return port T2.
[0033] When the boom of the bucket wheel excavator extends, the boom cylinder extends, and pressurized oil enters from the inlet V2, passes through the second balance valve 102, and simultaneously leads control oil to the control port of the first balance valve 101. Then, it passes through the second shut-off valve 202 and enters the rodless chamber W of the cylinder, causing the cylinder to extend continuously. The pressurized oil in the rod chamber Y, under the pressure of compression, passes through the first shut-off valve 201. Then, under the combined action of the pressure in the rod chamber Y of the control oil box, it opens the first balance valve 101 and returns to the oil tank through the outlet V1.
[0034] Furthermore, in order to safely and reliably stop the bucket wheel excavator boom at any position to complete the stacking and reclaiming work, and at the same time to avoid the risk of oil leakage caused by the hydraulic pipeline between the hydraulic station and the oil cylinder maintaining pressure for a long time, the pressure-holding elements, the first balance valve 101 and the second balance valve 102, are set at the inlet of the two chambers of the oil cylinder.
[0035] To prevent damage to the cylinder and the entire machine structure caused by a sudden increase in pitch due to pitch deceleration braking or material handling collapse, safety relief valve groups 300 are installed in the two chambers of the cylinder. When the working pressure exceeds the set value, the pressure oil in the rod chamber Y or rodless chamber W of the cylinder is released to the oil tank through the pipeline between the first relief valve 301 and the second relief valve 302 from the first leakage return port T1, so that the cylinder load will not exceed the set maximum value.
[0036] For ease of routine maintenance or cylinder disassembly and inspection, a first shut-off valve 201 and a second shut-off valve 202 are respectively installed in the two chambers of the cylinder. When the first shut-off valve 201 is completely closed, the pressure oil in the rod chamber Y is sealed in the rod chamber Y and the pipeline between the rod chamber Y and port C1. Because the valve block is directly installed in the oil port of the rodless chamber W, the pressure oil in the rodless chamber W is sealed in the rodless chamber W. This allows the cylinder to remain in the same position even if the valve block component fails.
[0037] To facilitate disassembly and maintenance of the valve block, a first unloading valve 401 and a second unloading valve 402 are respectively installed in the two chambers of the cylinder. The pressure circuits of the rod chamber Y and the rodless chamber W are connected to the oil tank through the first leakage return port. When it is necessary to disassemble and inspect the components, the unloading valve can be opened to release pressure and safely disassemble and inspect a series of components.
[0038] The system has a first check valve 501 and a second check valve 502 connected in parallel. Under load conditions (the direction of cylinder movement is the same as the load direction), oil is supplied to the non-forced chamber when the oil supply is insufficient, so as to avoid noise, vibration and cavitation caused by air entering.
[0039] Example 3
[0040] Reference Figure 1 This is the third embodiment of the present invention, which is based on the previous two embodiments. This embodiment provides a hydraulic system, which includes the hydraulic components in Embodiments 1 and 2, and further includes a first pressure sensor 701 and a second pressure sensor 702.
[0041] Specifically, the first pressure sensor 701 is connected to the pipeline between the first balance valve 101 and the first shut-off valve 201; the second pressure sensor 702 is connected to the pipeline between the second balance valve 102 and the second shut-off valve 201. The two pressure sensors can calculate the cylinder load based on the cylinder parameters. When the cylinder load deviates significantly from the theoretical value, an alarm can be triggered and the machine can be stopped to avoid overall machine stability issues caused by the boom's mechanical operation.
[0042] Furthermore, the boom pitch of a bucket wheel excavator is generally driven by two cylinders, consisting of a first cylinder and a second cylinder. The attached diagram only shows the valve block of a single cylinder; the principle of the other valve block is not described. Figure 1 To achieve a symmetrical arrangement.
[0043] To avoid load differences between the left and right cylinders caused by uneven loading of the boom, an interconnecting oil circuit is set up between the left and right cylinders, and equipped with a first interconnecting shut-off valve 601 and a second interconnecting shut-off valve 602. In the working state, the rod chamber Y and the rodless chamber W of the two cylinders are connected respectively, and the pressure is consistent.
[0044] In case of a single hydraulic cylinder failure, close the first inter-shut valve 601 and the second inter-shut valve 602, and the two hydraulic cylinders will independently support the boom. Even if one hydraulic cylinder fails, the other hydraulic cylinder can still independently support the boom.
[0045] The aforementioned hydraulic components are integrated into a new cylinder valve assembly, located in the rodless chamber W. The valve assembly uses threaded cartridge valves, which offer numerous advantages such as ease of machining, convenient assembly and disassembly, compact structure, high interchangeability, suitability for mass production, high cost-effectiveness, zero leakage, and reliable pressure holding, resulting in safer system operation and more comprehensive protection.
[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A protective valve block for the boom pitch cylinder of a bucket wheel excavator, characterized in that: include, The first balance valve (101) and the second balance valve (102) are connected in parallel. One end of the first balance valve (101) is connected to the oil outlet (V1) and the other end is connected to the rod chamber (Y) of the oil cylinder. One end of the second balance valve (102) is connected to the oil inlet (V2) and the other end is connected to the rodless chamber (W) of the oil cylinder. A first shut-off valve (201) is installed on the pipeline between the first balancing valve (101) and the rod chamber (Y), and a second shut-off valve (202) is installed on the pipeline between the second balancing valve (102) and the rodless chamber (W); An overflow valve assembly (300) is disposed between the first shut-off valve (201) and the second shut-off valve (202).
2. The bucket wheel excavator boom pitch cylinder protection valve block as described in claim 1, characterized in that: The first balancing valve (101) and the second balancing valve (102) are interconnected and both are connected to the second leakage return port (T2).
3. The bucket wheel excavator boom pitch cylinder protection valve block as described in claim 2, characterized in that: The overflow valve assembly (300) includes a first overflow valve (301) and a second overflow valve (302) connected in series, and both are connected to the first leakage return port (T1).
4. The bucket wheel excavator boom pitch cylinder protection valve block as described in claim 3, characterized in that: It also includes a first unloading valve (401) and a second unloading valve (402) connected in parallel with the overflow valve assembly (300). The first unloading valve (401) and the second unloading valve (402) are connected in series and are both connected to the first leakage return port (T1).
5. The bucket wheel excavator boom pitch cylinder protection valve block as described in claim 4, characterized in that: It also includes a first check valve (501) and a second check valve (502). The outlet of the first check valve (501) is connected to the first shut-off valve (201), and the outlet of the second check valve (502) is connected to the second shut-off valve (202). The inlets of the first check valve (501) and the second check valve (502) are connected to each other and are both connected to the first leakage return port (T1).
6. The bucket wheel excavator boom pitch cylinder protection valve block as described in claim 5, characterized in that: It also includes a first inter-shut-off valve (601) and a second inter-shut-off valve (602). One end of the first inter-shut-off valve (601) is connected to the first inter-switching port (V11), and the other end is connected to the outlet of the first check valve (501). One end of the second inter-shut-off valve (602) is connected to the second inter-switching port (V12), and the other end is connected to the outlet of the second check valve (502).
7. The bucket wheel excavator boom pitch cylinder protection valve block as described in claim 6, characterized in that: The first leakage return port (T1) is interconnected with the second leakage return port (T2).
8. The bucket wheel excavator boom pitch cylinder protection valve block as described in claim 7, characterized in that: The protective valve block is integrally installed in the rodless chamber (W) of the oil cylinder.
9. A hydraulic system, characterized in that: Including the bucket wheel excavator boom pitch cylinder protection valve block as described in any one of claims 4 to 8, and further comprising, A first pressure sensor (701) and a second pressure sensor (702) are provided. The mounting port of the first pressure sensor (701) is connected to the first unloading valve (401), and the mounting port of the second pressure sensor (702) is connected to the second unloading valve (402).
10. The hydraulic system as described in claim 9, characterized in that: There are two hydraulic cylinders, namely a first hydraulic cylinder and a second hydraulic cylinder, both of which are equipped with the aforementioned protective valve block.