Pilot valve group of miniature excavator

Abstract

The utility model provides a pilot valve bank of a miniature excavator, which relates to the technical field of pilot valve banks of miniature excavators, and comprises a pilot valve bank body. By arranging a limiting device, when an excavator is controlled by using the pilot valve bank body, one end of an oil way pipe is propped against an overflow valve, and the other end of the oil way pipe is propped against the overflow valve; then the threaded block fixed at one end of the threaded rod is in threaded connection and screwed with the threaded ring block on the overflow valve, so that the oil way pipe is fixedly installed on the overflow valve, at the moment, after the threaded rod is manually held and screwed to a certain position on the threaded hole rod, the clamping block can be driven to move downwards and then clamped in the corresponding clamping groove, and the threaded ring block is limited and fixed; in this way, when the excavator is used, the whole excavator body vibrates when the excavator works, the threaded ring block at the connecting position of the overflow valve and the oil way pipe is not prone to slipping or loosening under long-time vibration, hydraulic oil is prevented from leaking, and the using effect of the excavator is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a pilot valve group for a mini excavator, in particular to a pilot valve group for a mini excavator. Background Art

[0002] The excavator pilot valve group is an important component of the excavator hydraulic system. It is mainly used to manipulate and adjust the large flow of working oil in the main hydraulic system through a small flow of control oil to realize the action of various working devices of the excavator and ensure the efficient, safe and precise control of the excavator hydraulic system.

[0003] When using the pilot valve group body to control the excavator, an oil pipe is usually installed on the relief valve. When the system pressure inside the pilot valve group body exceeds the pressure set by the relief valve, the relief valve will open and allow the hydraulic oil to flow back to the tank through the oil pipe. When the excavator is working, the entire body will vibrate. Long-term vibration may cause the threaded ring block at the connection between the oil pipe and the relief valve to loosen, thereby causing hydraulic oil leakage and affecting the use of the excavator. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a pilot valve group for a mini excavator.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a mini excavator pilot valve group, including a pilot valve group body, overflow valves are arranged on both sides of the pilot valve group body, one side of the overflow valve is rotatably connected with a threaded ring block, one side of the pilot valve group body is provided with a limiting device, the limiting device includes a screw hole rod, a disassembly device is arranged between one end of the screw hole rod and one side of the pilot valve group body, the inner wall of the screw hole rod is threadedly connected with a threaded rod, one end of the threaded rod is rotatably connected with a clamping block, the outer surface of the threaded ring block is provided with a plurality of clamping grooves, and one end of the clamping block is inserted in the inner wall of the clamping groove.

[0006] The effect achieved by the above components is: by setting the limit device, when the excavator uses the pilot valve group body for control, first put one end of the oil pipe against the overflow valve, and then thread the threaded block fixed at one end thereof with the threaded ring block on the overflow valve and tighten it, so that the oil pipe is fixedly installed on the overflow valve. At this time, manually hold the threaded rod and screw it on the screw hole rod to a certain position, which can drive the block to move downward, and then get stuck in the corresponding slot to limit and fix the threaded ring block. In this way, when in use, when the excavator is working, the entire body vibrates, so that the threaded ring block at the connection position of the overflow valve and the oil pipe is not easy to slip and loosen under long-term vibration, so as to prevent hydraulic oil from leaking out and improve the use effect of the excavator.

[0007] Preferably, a telescopic rod is fixedly connected to one side of the clamping block, and one end of the telescopic rod is fixedly connected to one side of the screw hole rod.

[0008] The effect achieved by the above components is: by setting the telescopic rod, the movement direction of the block can be limited, so that when the threaded rod drives the block to move, the block is not easy to rotate with the rotation of the threaded rod, thereby reducing the friction with the threaded ring block.

[0009] Preferably, a rubber block is fixedly connected to the outer surface of one end of the clamping block, and the rubber block is inserted into the inner wall of the clamping slot along with the clamping block.

[0010] The effect achieved by the above components is: by setting the rubber block, the contact friction force of the outer surface of the block can be increased, so that it is not easy to shake after being stuck in the slot, and the threaded ring block is more firmly limited, so that it is not easy to shake due to self-rotation.

[0011] Preferably, one end of the threaded rod is fixedly connected to an operating block, and the outer surface of the operating block is fixedly connected to a plurality of anti-slip protrusions.

[0012] The effect achieved by the above components is that by setting the operating block, the contact area of ​​one end of the threaded rod can be increased, making it convenient to manually grasp and twist one end of the threaded rod.

[0013] Preferably, a bearing is fixedly connected to the outer surface of one end of the threaded rod, and the outer ring of the bearing is fixedly connected to one side of the block.

[0014] The effect achieved by the above components is that by arranging the bearing, the contact wear between the threaded rod and the clamping block can be reduced, thereby increasing the service life of both.

[0015] Preferably, the easy disassembly device includes a limit rod, rectangular grooves are provided on both sides of the pilot valve group body, one end of the screw hole rod is inserted in the inner wall of the rectangular groove, a first clamping hole is provided on one side of the inner wall of the rectangular groove, a second clamping hole is provided on one side of the screw hole rod, one end of the limit rod is inserted in the inner walls of the first clamping hole and the second clamping hole, and a spring is sleeved and connected on the outer surface of the limit rod, and both ends of the spring are respectively fixedly connected to the pilot valve group body and one side of the clamping block.

[0016] The effect achieved by the above-mentioned components is: by setting up a device that is easy to disassemble, when the threaded rod needs to be maintained or replaced, the limit rod can be manually held and pushed upward to a certain position in the first clamping hole and the second clamping hole, driving the spring to be stretched and one end to be pulled out of the second clamping hole. At this time, by holding the screw hole rod and pulling it to one end, it can be pulled out of the rectangular groove, so that the threaded rod can be removed from the pilot valve group body, which is convenient for its replacement. Similarly, the replaced screw hole rod can be installed on one side of the pilot valve group body, and the spring can limit the block on the first clamping hole and the pilot valve group body to prevent it from being lost.

[0017] Preferably, both sides of the pilot valve group body are symmetrically fixedly connected with limit blocks, and the two limit blocks are fixed on both sides of the entrance of the rectangular groove in an inclined manner.

[0018] The effect achieved by the above components is: by setting the limit block, the area at the entrance of the rectangular groove can be increased, so that the screw hole rod can be quickly aligned with the entrance of the rectangular groove and one end of it can be inserted and installed therein.

[0019] Preferably, the cross-section of one end of the screw hole rod is trapezoidal, and the trapezoidal end of the screw hole rod is close to the second clamping hole.

[0020] The effect achieved by the above components is: by setting one end of the screw hole rod into a trapezoidal shape, the area of ​​one end of the screw hole rod can be reduced, so that the screw hole rod can be quickly inserted into the rectangular groove.

[0021] Compared with the prior art, the advantages and positive effects of the utility model are:

[0022] In the utility model, by setting a limit device, when the excavator uses the pilot valve group body for control, first one end of the oil pipe is abutted against the overflow valve, and then the threaded block fixed at one end is threadedly connected and tightened with the threaded ring block on the overflow valve, so that the oil pipe is fixedly installed on the overflow valve. At this time, the threaded rod is manually held and screwed on the screw hole rod to a certain position, which can drive the clamping block to move downward, and then clamp it in the corresponding clamping groove to limit and fix the threaded ring block. In this way, when in use, when the excavator is working, the entire body vibrates, so that the threaded ring block at the connection position between the overflow valve and the oil pipe is not easy to slip and loosen under long-term vibration, so as to prevent the hydraulic oil from leaking out and improve the use effect of the excavator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the screw hole rod of the utility model;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the pilot valve group body of the utility model;

[0026] Figure 4 for Figure 3 A in the middle is an enlarged schematic diagram of the three-dimensional structure.

[0027] Legend: 1. Pilot valve group body; 2. Limit device; 3. Easy disassembly device; 4. Overflow valve; 5. Threaded ring block; 21. Screw hole rod; 22. Threaded rod; 23. Clamp block; 24. Telescopic rod; 25. Rubber block; 26. Bearing; 27. Operating block; 28. Clamping groove; 31. Rectangular groove; 32. First clamping hole; 33. Limit rod; 34. Spring; 35. Limit block; 36. Second clamping hole. DETAILED DESCRIPTION

[0028] Embodiment 1, as Figure 1-4 As shown, a pilot valve group for a mini excavator includes a pilot valve group body 1, overflow valves 4 are arranged on both sides of the pilot valve group body 1, one side of the overflow valve 4 is rotatably connected with a threaded ring block 5, one side of the pilot valve group body 1 is provided with a limiting device 2, the limiting device 2 includes a screw hole rod 21, and a disassembly device 3 is arranged between one end of the screw hole rod 21 and one side of the pilot valve group body 1, the inner wall of the screw hole rod 21 is threadedly connected with a threaded rod 22, one end of the threaded rod 22 is rotatably connected with a clamping block 23, and the outer surface of the threaded ring block 5 is provided with a plurality of clamping grooves 28, and one end of the clamping block 23 is inserted into the inner wall of the clamping groove 28. When the excavator uses the pilot valve group body 1 for control, first put one end of the oil pipe against the relief valve 4, and then thread the threaded block fixed at one end thereof with the threaded ring block 5 on the relief valve 4 and tighten it, so that the oil pipe is fixedly installed on the relief valve 4. At this time, manually hold the threaded rod 22 and screw it on the screw hole rod 21 to a certain position, which can drive the clamping block 23 to move downward, and then clamp it in the corresponding clamping groove 28 to limit and fix the threaded ring block 5. In this way, when in use, when the excavator is working, the entire body vibrates, so that the threaded ring block 5 at the connection position of the relief valve 4 and the oil pipe is not easy to be loosened under long-term vibration, so as to prevent the hydraulic oil from leaking out and improve the use effect of the excavator.

[0029] Reference Figure 2As shown, this embodiment discloses that a telescopic rod 24 is fixedly connected to one side of the block 23, and one end of the telescopic rod 24 is fixedly connected to one side of the screw hole rod 21. By setting the telescopic rod 24, the movement direction of the block 23 can be limited, so that when the threaded rod 22 drives the block 23 to move, the block 23 is not easy to rotate with the rotation of the threaded rod 22, thereby reducing the friction with the threaded ring block 5. A rubber block 25 is fixedly connected to the outer surface of one end of the block 23, and the rubber block 25 is inserted into the inner wall of the slot 28 along with the block 23. By setting the rubber block 25, the contact friction force of the outer surface of the block 23 can be increased, so that it is not easy to shake after being stuck in the slot 28, and the threaded ring block 5 is more firmly limited, so that it is not easy to shake due to self-rotation.

[0030] Reference Figure 2 As shown, the present embodiment discloses that an operating block 27 is fixedly connected to one end of the threaded rod 22, and a plurality of anti-slip protrusions are fixedly connected to the outer surface of the operating block 27. By providing the operating block 27, the contact area of ​​one end of the threaded rod 22 can be increased, and it is convenient to manually grasp and twist one end of the threaded rod 22. A bearing 26 is fixedly connected to the outer surface of one end of the threaded rod 22, and the outer ring of the bearing 26 is fixedly connected to one side of the clamping block 23. By providing the bearing 26, the contact wear between the threaded rod 22 and the clamping block 23 can be reduced, and the service life of both can be increased.

[0031] Reference Figure 3 and Figure 4 As shown, the present embodiment discloses that the easy disassembly device 3 includes a limit rod 33, rectangular grooves 31 are provided on both sides of the pilot valve group body 1, one end of the screw hole rod 21 is inserted in the inner wall of the rectangular groove 31, a first clamping hole 32 is provided on one side of the inner wall of the rectangular groove 31, a second clamping hole 36 is provided on one side of the screw hole rod 21, one end of the limit rod 33 is inserted in the inner walls of the first clamping hole 32 and the second clamping hole 36, and a spring 34 is sleeved and connected on the outer surface of the limit rod 33, and the two ends of the spring 34 are respectively fixedly connected to the pilot valve group body 1 and one side of the clamping block 23. When the threaded rod 22 needs to be maintained or replaced, the limit rod 33 can be manually held to be pulled out upward in the first clamping hole 32 and the second clamping hole 36 to a certain position, driving the spring 34 to be stretched and one end to be pulled out from the second clamping hole 36. At this time, by holding the screw hole rod 21 and pulling it toward one end, it can be pulled out from the rectangular groove 31, so that the threaded rod 22 can be removed from the pilot valve group body 1 for easy replacement. Similarly, the replaced screw hole rod 21 can be installed on one side of the pilot valve group body 1, and the spring 34 can limit the block 23 on the first clamping hole 32 and the pilot valve group body 1 to prevent it from being lost.

[0032] Reference Figure 3 and Figure 4As shown, the present embodiment discloses that both sides of the pilot valve group body 1 are symmetrically fixedly connected with limit blocks 35, and the two limit blocks 35 are fixed on both sides of the entrance of the rectangular groove 31 in an inclined manner. By setting the limit blocks 35, the area at the entrance of the rectangular groove 31 can be increased, so that the screw hole rod 21 can be quickly aligned with the entrance of the rectangular groove 31, and one end of it can be inserted and installed. The cross-section of one end of the screw hole rod 21 is trapezoidal, and the end of the screw hole rod 21 in the trapezoidal shape is close to the second clamping hole 36. By setting one end of the screw hole rod 21 in a trapezoidal shape, the area of ​​one end of the screw hole rod 21 can be reduced, so that the screw hole rod 21 can be quickly clamped into the rectangular groove 31.

[0033] Working principle: when the excavator uses the pilot valve group body 1 for control, first put one end of the oil pipe against the relief valve 4, and then thread the threaded block fixed at one end thereof with the threaded ring block 5 on the relief valve 4 and tighten it, so that the oil pipe is fixedly installed on the relief valve 4. At this time, manually hold the operating block 27 to screw the threaded rod 22 on the screw hole rod 21 to a certain position. Under the limiting action of the telescopic rod 24, the clamping block 23 can be driven to move downward, so that one end of it and the rubber block 25 are stuck in the corresponding clamping groove 28, and the threaded ring block 5 is limited and fixed. In this way, when in use, when the excavator is working, the entire body vibrates, so that the threaded ring block 5 at the connection position of the relief valve 4 and the oil pipe is not easy to be loosened under long-term vibration, so as to prevent the hydraulic oil from leaking out and improve the use effect of the excavator.

[0034] When the threaded rod 22 needs to be maintained or replaced, the limit rod 33 can be manually held to be pulled out upward in the first clamping hole 32 and the second clamping hole 36 to a certain position, driving the spring 34 to be stretched and one end to be pulled out from the second clamping hole 36. At this time, by holding the screw hole rod 21 and pulling it toward one end, it can be pulled out from the rectangular groove 31, so that the threaded rod 22 can be removed from the pilot valve group body 1 for easy replacement. Similarly, the replaced screw hole rod 21 can be installed on one side of the pilot valve group body 1, and the spring 34 can limit the block 23 on the first clamping hole 32 and the pilot valve group body 1 to prevent it from being lost.

Claims

1. A pilot valve assembly for a mini excavator, comprising a pilot valve assembly body (1), characterized in that: Both sides of the pilot valve group body (1) are provided with relief valves (4), one side of the relief valve (4) is rotatably connected to a threaded ring block (5), one side of the pilot valve group body (1) is provided with a limit device (2), the limit device (2) comprises a screw hole rod (21), one end of the screw hole rod (21) and a disassembly device (3) is provided between the side of the pilot valve group body (1), the inner wall of the screw hole rod (21) is threadedly connected to a threaded rod (22), one end of the threaded rod (22) is rotatably connected to a clamping block (23), the outer surface of the threaded ring block (5) is provided with a plurality of clamping grooves (28), one end of the clamping block (23) is inserted into the inner wall of the clamping groove (28).

2. A mini excavator pilot valve assembly according to claim 1, characterized in that: A telescopic rod (24) is fixedly connected to one side of the clamping block (23), and one end of the telescopic rod (24) is fixedly connected to one side of the screw hole rod (21).

3. The mini excavator pilot valve assembly according to claim 1, characterized in that: A rubber block (25) is fixedly connected to the outer surface of one end of the clamping block (23), and the rubber block (25) is inserted into the inner wall of the clamping slot (28) along with the clamping block (23).

4. The mini excavator pilot valve assembly according to claim 1, characterized in that: One end of the threaded rod (22) is fixedly connected to an operating block (27), and the outer surface of the operating block (27) is fixedly connected to a plurality of anti-slip protrusions.

5. The mini excavator pilot valve assembly according to claim 1, characterized in that: A bearing (26) is fixedly connected to the outer surface of one end of the threaded rod (22), and an outer ring of the bearing (26) is fixedly connected to one side of the clamping block (23).

6. The mini excavator pilot valve assembly according to claim 1, characterized in that: The easy disassembly device (3) comprises a limit rod (33), rectangular grooves (31) are provided on both sides of the pilot valve group body (1), one end of the screw hole rod (21) is inserted into the inner wall of the rectangular groove (31), a first clamping hole (32) is provided on one side of the inner wall of the rectangular groove (31), a second clamping hole (36) is provided on one side of the screw hole rod (21), one end of the limit rod (33) is inserted into the inner walls of the first clamping hole (32) and the second clamping hole (36), and a spring (34) is sleeved and connected on the outer surface of the limit rod (33), and two ends of the spring (34) are respectively fixedly connected to the pilot valve group body (1) and one side of the clamping block (23).

7. A mini excavator pilot valve assembly according to claim 6, characterized in that: Both sides of the pilot valve group body (1) are symmetrically fixedly connected with limit blocks (35), and the two limit blocks (35) are fixed in an inclined manner on both sides of the entrance of the rectangular groove (31).

8. The mini excavator pilot valve assembly according to claim 6, characterized in that: The cross section of one end of the screw hole rod (21) is in a trapezoidal shape, and the trapezoidal end of the screw hole rod (21) is close to the second clamping hole (36).

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