Leveling valve and engineering machine

Abstract

The utility model provides a kind of leveling valve, for engineering machinery, the leveling valve includes valve block, the valve block is equipped with valve cavity, the valve cavity is equipped with movable main valve core, the both sides of main valve core are further equipped with several oil ports;The one end of valve cavity is equipped with third plug, the other end of valve cavity is equipped with fourth plug;Second spring is further equipped in the valve cavity, and the second spring is set to the one end of main valve core close to third plug;Valve block is further equipped with several throttling valves, and throttling valve is communicated with valve cavity;Valve block is further equipped with several check valves, and check valve is communicated with valve cavity, and adjustable damper with aperture is equipped on check valve core.This structure's leveling valve, compared with the leveling valve of existing structure, it has the advantages of simple structure compact, easy to adjust.At the same time, it can also effectively reduce the pressure when leveling system works, so that mechanical leveling is more convenient.In addition, the utility model further proposes a kind of engineering machinery.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a leveling valve and engineering machinery. Background Technology

[0002] In recent years, with the continuous advancement of urbanization in my country, China has become the largest producer and seller of construction machinery, and various types of construction machinery are increasingly widely used in various engineering construction projects.

[0003] Construction machinery typically includes a hydraulic system, comprising a hydraulic tank, pump, motor, and various hydraulic valves. These valves include flow valves, pressure valves, and directional valves, with pressure valves including leveling valves. These systems are widely used, such as in skid steer loaders. However, the widely used leveling valves have been found to have problems during use, including a lack of compact design and inconvenient adjustment during leveling. Furthermore, there is a tendency for pressure buildup to occur during the leveling system's operation.

[0004] In summary, how to provide a leveling valve with a simple and compact structure, convenient adjustment during leveling, and the ability to reduce pressure build-up during the operation of the leveling system, as well as engineering machinery including this leveling valve, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a simple and compact leveling valve that is easy to adjust during leveling and can reduce the pressure build-up during the operation of the leveling system, as well as engineering machinery including this leveling valve.

[0006] The solution of this utility model is implemented as follows: This utility model proposes a leveling valve for use in engineering machinery. The leveling valve includes a valve block, a valve cavity within the valve block, a movable main valve core within the valve cavity, and several oil ports on both sides of the main valve core. A third plug is provided at one end of the valve cavity, and a fourth plug is provided at the other end of the valve cavity. A second spring is also provided within the valve cavity, positioned at the end of the main valve core near the third plug. Several throttle valves are also provided on the valve block, communicating with the valve cavity. Several one-way valves are also provided on the valve block, communicating with the valve cavity. The one-way valve core is equipped with a damper with an adjustable orifice. Compared with existing leveling valves, this leveling valve has the advantages of simple and compact structure and convenient adjustment. Furthermore, by providing dampers on components such as the one-way valve core, the pressure buildup during the leveling system's operation can be effectively reduced, making leveling easier for engineering machinery such as skid steer loaders.

[0007] Another technical solution of this utility model is that, based on the above, the valve block is further provided with a sixth plug, the sixth plug is disposed on one side of the third plug, the sixth plug is provided with a damping hole, the damping hole is provided with a damping plug, and the diameter of the damping hole is adjustable.

[0008] Another technical solution of this utility model is that, based on the above, one end of the second spring abuts against the end of the main valve core near the third plug, and the other end of the second spring abuts against the fourth plug.

[0009] Another technical solution of this utility model is that, based on the above, the leveling valve further includes a second sealing ring that serves a sealing function, and the second sealing ring is disposed between the valve block and the third plug.

[0010] Another technical solution of this utility model is that, based on the above, the leveling valve further includes a first spring, and the throttle valve includes a throttle valve core, with the first spring sleeved on the throttle valve core.

[0011] Another technical solution of this utility model is that, based on the above, one end of the throttle valve core is further provided with a second plug, and a first sealing ring for sealing is provided between the second plug and the valve block.

[0012] Another technical solution of this utility model is that, based on the above, the leveling valve further includes a third spring, the one-way valve includes a one-way valve core, and the third spring is disposed on the one-way valve core.

[0013] Another technical solution of this utility model is that, based on the above, the leveling valve further includes a third sealing ring that plays a sealing role. The third sealing ring is disposed between the one-way valve and the valve block. The first sealing ring, the second sealing ring, and the third sealing ring are all O-rings.

[0014] Another technical solution of this utility model is that, based on the above, the valve block is further provided with a first plug and a sixth plug, the first plug and the sixth plug being respectively disposed on two opposite end faces of the valve block.

[0015] On the other hand, this utility model also proposes an engineering machinery, including a hydraulic system, wherein the hydraulic system includes a leveling valve, and the leveling valve is the leveling valve as described above. Attached Figure Description

[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0017] Figure 1 This is a front view of a leveling valve according to the present invention; Figure 2 for Figure 1 The right view; Figure 3 for Figure 1 The left view; Figure 4 for Figure 3 Schematic sectional view along the middle AA direction; Figure 5 for Figure 2 Cross-sectional view along the middle BB direction; Figure 6 This is a schematic diagram illustrating the working principle of a leveling valve according to this utility model. Figure 7 This is a schematic diagram of another leveling valve according to the present invention; Figure 8 for Figure 7 Cross-sectional view along the DD direction; Figure 9 for Figure 7 Cross-sectional view along the CC direction.

[0018] The correspondence between the reference numerals in the attached figures is as follows: 1 Valve block 2 First plug 3 Throttling valve core 4 First spring; 5 First sealing ring; 6 Second plug 7 Main valve core; 8 Second spring; 9 Second sealing ring 10 Third plug 11 Fourth plug 12 One-way valve core 13 Damping plug 14 Fifth plug 15 Sixth plug 16 Third sealing ring 17 One-way valve 18 Third spring Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings. This description is merely illustrative and explanatory, and should not be construed as limiting the scope of protection of the present invention. Furthermore, those skilled in the art can combine the features in the embodiments described herein and in different embodiments according to the description in this document.

[0020] The embodiments of this utility model are as follows, please refer to them. Figures 1 to 9 The leveling valve shown is used in construction machinery, such as skid steer loaders. The leveling valve includes a valve block 1, within which a valve chamber is located. Inside the valve chamber is a main valve core 7, which can move left and right within the valve chamber. Several oil ports are also provided on both sides of the main valve core 7. One end of the valve chamber, i.e. Figure 4 The left end shown also has a third plug 10, and the other end of the valve chamber, namely Figure 4The left end shown also has a fourth plug 11. A second spring 8 is also provided inside the valve cavity. Specifically, the second spring 8 is located at the end of the main valve core 7 near the third plug 10. Figure 4 As shown on the right end, valve block 1 is also equipped with several throttle valves, which are connected to the valve chamber. Valve block 1 is also equipped with several one-way valves 17, which are connected to the same valve chamber. The one-way valve core 12 is equipped with an adjustable-aperture damper. Compared with existing leveling valves, this structure of leveling valve has the advantages of simple and compact structure and convenient adjustment. At the same time, by setting dampers on components such as the one-way valve core 12, the pressure buildup during leveling system operation can be effectively reduced, making leveling easier for construction machinery such as skid steer loaders.

[0021] Based on the above embodiments, in another embodiment of the present invention, such as Figures 1 to 9 As shown, the valve block 1 is also provided with a sixth plug 15, which is located on one side of the third plug 10, i.e. Figure 4 As shown on the upper side, the sixth plug 15 is provided with a damping hole, and a damping plug 13 is provided in the damping hole. The diameter of the damping hole can be adjusted as needed.

[0022] Based on the above embodiments, in another embodiment of the present invention, such as Figure 4 As shown, one end of the second spring 8, i.e. the left end shown in the figure, abuts against the end of the main valve core 7 near the third plug 10, i.e. the right end shown in the figure, while the other end of the second spring 8, i.e. the right end shown in the figure, abuts against the fourth plug 11.

[0023] Based on the above embodiments, in another embodiment of the present invention, such as Figure 4 As shown, the leveling valve also includes a second sealing ring 9 that serves a sealing function, and the second sealing ring 9 is disposed between the valve block 1 and the third plug 10.

[0024] Based on the above embodiments, in another embodiment of the present invention, such as Figure 4 As shown, the leveling valve also includes a first spring 4, and the throttle valve includes a throttle valve core 3. The throttle valve core 3 is also provided with a damping orifice with an adjustable diameter, and the first spring 4 is sleeved on the throttle valve core 3.

[0025] Based on the above embodiments, in another embodiment of the present invention, such as Figure 4 As shown, one end of the throttle valve core 3, i.e. the left end shown in the figure, is also provided with a second plug 6, and a first sealing ring 5 that plays a sealing role is also provided between the second plug 6 and the valve block 1.

[0026] Based on the above embodiments, in another embodiment of the present invention, such as Figure 4As shown, the leveling valve also includes a third spring 18, and the one-way valve 17 includes a one-way valve core 12, with the third spring 18 disposed on the one-way valve core 12. It should be noted that the first spring 4, the second spring 8, and the third spring 18 are all reset springs that serve a reset function.

[0027] Based on the above embodiments, in another embodiment of the present invention, such as Figure 4 As shown, the leveling valve also includes a third sealing ring 19 that provides a sealing function. The third sealing ring 19 is located between the one-way valve 17 and the valve block 1. The first sealing ring 5, the second sealing ring 9, and the third sealing ring 19 are all O-rings, preferably made of rubber or plastic.

[0028] Based on the above embodiments, in another embodiment of the present invention, such as Figure 4 As shown, the valve block 1 is also provided with a first plug 2 and a fifth plug 14. The first plug 2 and the fifth plug 14 are respectively provided on two opposite end faces of the valve block 1, namely the upper end face and the lower end face shown in the figure.

[0029] This type of leveling valve has the advantages of simple and compact structure and convenient adjustment. By setting a damper on the one-way valve core 12, and by setting an adjustable damping orifice in the sixth plug 15, when this type of leveling valve is used in construction machinery such as skid steer loaders, it can effectively reduce the pressure build-up during the operation of the leveling system, making it easier for the skid steer loader to level.

[0030] Furthermore, this utility model also proposes an engineering machine, including a hydraulic system, wherein the hydraulic system includes a leveling valve, which is the leveling valve described above. For the engineering machine, a skid steer loader is preferred.

[0031] The engineering machinery with this structure, correspondingly, possesses the advantages of the aforementioned leveling valve.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leveling valve for use in engineering machinery, characterized in that, The leveling valve includes a valve block, a valve chamber inside the valve block, a movable main valve core inside the valve chamber, and several oil ports on both sides of the main valve core. A third plug is provided at one end of the valve cavity, and a fourth plug is provided at the other end of the valve cavity; The valve cavity is also provided with a second spring, which is located at one end of the main valve core near the third plug. The valve block is also provided with a number of throttle valves, which are connected to the valve cavity; The valve block is also provided with several one-way valves, which are connected to the valve cavity, and the one-way valves are provided with dampers with adjustable orifice diameters.

2. The leveling valve according to claim 1, characterized in that, The valve block is also provided with a sixth plug, which is located on one side of the third plug. The sixth plug has a damping hole inside, and a damping plug is provided inside the damping hole. The diameter of the damping hole is adjustable.

3. The leveling valve according to claim 2, characterized in that, One end of the second spring abuts against the end of the main valve core near the third plug, and the other end of the second spring abuts against the fourth plug.

4. The leveling valve according to claim 3, characterized in that, The leveling valve also includes a second sealing ring that provides a sealing function, and the second sealing ring is disposed between the valve block and the third plug.

5. The leveling valve according to claim 4, characterized in that, The leveling valve further includes a first spring, and the throttle valve includes a throttle valve core, with the first spring sleeved on the throttle valve core.

6. The leveling valve according to claim 5, characterized in that, One end of the throttle valve core is also provided with a second plug, and a first sealing ring for sealing is provided between the second plug and the valve block.

7. The leveling valve according to claim 6, characterized in that, The leveling valve further includes a third spring, and the one-way valve includes a one-way valve core, with the third spring disposed on the one-way valve core.

8. The leveling valve according to claim 7, characterized in that, The leveling valve also includes a third sealing ring that provides a sealing function. The third sealing ring is disposed between the one-way valve and the valve block. The first sealing ring, the second sealing ring, and the third sealing ring are all O-rings.

9. The leveling valve according to claim 8, characterized in that, The valve block is also provided with a first plug and a sixth plug, which are respectively disposed on two opposite end faces of the valve block.

10. An engineering machine, comprising a hydraulic system, said hydraulic system including a leveling valve, characterized in that, The leveling valve is the leveling valve according to any one of claims 1 to 9.

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