CN221173256U

CN221173256U - Valve core displacement detection mechanism of multi-way reversing valve

Info

Publication number: CN221173256U
Application number: CN202323341330.0U
Authority: CN
Inventors: 汪立平; 常成
Original assignee: Jiangsu Hengli Hydraulic Technology Co Ltd
Current assignee: Jiangsu Hengli Hydraulic Technology Co Ltd
Priority date: 2023-12-07
Filing date: 2023-12-07
Publication date: 2024-06-18
Anticipated expiration: 2033-12-07

Abstract

The utility model relates to the technical field of displacement detection, in particular to a valve core displacement detection mechanism of a multi-way reversing valve, which comprises a cylinder body, wherein a first reversing pilot oil port is arranged on the cylinder body; the displacement detection assembly is arranged at the left end of the cylinder body and is used for detecting displacement by adopting a magnetostriction displacement detection principle; the guide end cover is arranged at the right end of the cylinder body; the piston is movably arranged in the cylinder body, the left end of the piston is connected with the displacement detection assembly, and the right end of the piston is connected with the guide end cover; the left end of the connector is connected with the guide end cover, and the right end of the connector is connected with the valve body; the probe penetrates through the guide end cover and the connector, the left end of the probe is connected with the piston, and the right end of the probe is connected with the valve core of the reversing valve. The utility model adopts magnetostriction displacement detection principle to detect displacement, and uses non-contact induction technique principle to measure displacement, thus improving measurement accuracy without mechanical abrasion and prolonging service life of the whole mechanism.

Description

Valve core displacement detection mechanism of multi-way reversing valve

Technical Field

The utility model relates to the technical field of displacement detection, in particular to a valve core displacement detection mechanism of a multi-way reversing valve.

Background

The valve core end cover of the hydraulic control multi-way reversing valve is connected with the pipeline through the threaded interface, pilot pressure oil enters the valve core end cover through the pipeline to push the valve core to displace, and when pilot pressure of the pilot pressure oil is different, valve core displacement of the multi-way reversing valve is different. When the multiplex valve is subjected to factory or research and development tests, the detection of the valve core displacement is a key test item.

The existing common detection tool is a rebound integrated displacement detection tool, and the tool has the following defects:

1. The existing rebound integrated valve core displacement detection tool has the defects that due to the specificity of a structure, the length and the size of an electronic bin and a measuring rod are large, more parts are needed to be matched for displacement detection, and sensing parts are contacted, so that the abrasion is serious after long-time use, and the detection precision is reduced; and this kind of displacement sensor installs in the outside of frock mechanism main part, leads to frock mechanism's overall dimension very big, has wasted the space in test station district to probably can interfere with the structure of valve under test, the application space is restricted.

2. The measuring rod is exposed outside from the rebound spring, the hand risk of an operator is hurt by the volume clamp in the compression process, and impurities such as scrap iron and the like easily pollute the measuring rod and abrade.

3. The connection mode of the rebound integrated displacement sensor and the displacement mechanism main body is in a hoop mode, and the rebound integrated displacement sensor is easy to loosen and fall off for a long time and influences the testing precision.

Disclosure of utility model

The utility model aims to solve one of the technical problems existing in the prior art. Therefore, the valve core displacement detection mechanism of the multi-way reversing valve is connected with the valve core displacement detection mechanism and the valve body to be detected through the connector, is simple to install through screw tightening, and can not interfere when two adjacent detection mechanisms are detected simultaneously; the displacement detection assembly based on the magnetostriction detection principle improves the measurement precision, does not generate mechanical abrasion, and prolongs the service life of the whole mechanism; through setting up the elastic component inside the cylinder body, avoided operating personnel's hand to be pressed from both sides the risk of damaging by the elastic component, and make whole size reduce, saved installation space.

The technical scheme adopted for solving the technical problems is as follows: the valve core displacement detection mechanism of the multi-way reversing valve comprises a cylinder body, wherein a first reversing pilot oil port is arranged on the cylinder body; the displacement detection assembly is arranged at the left end of the cylinder body and is used for carrying out displacement detection by adopting a magnetostriction displacement detection principle; the guide end cover is arranged at the right end of the cylinder body; the piston is movably arranged in the cylinder body, the left end of the piston is connected with the displacement detection assembly, and the right end of the piston is connected with the guide end cover; the left end of the connector is connected with the guide end cover, and the right end of the connector is connected with the valve body; the probe penetrates through the guide end cover and the connector, the left end of the probe is connected with the piston, and the right end of the probe is connected with the valve core of the reversing valve.

According to the valve core displacement detection mechanism of the multi-way reversing valve, the pilot pressure oil is injected through the first reversing pilot oil port, the position of the piston in the cylinder body is changed by changing the oil pressure of the pilot pressure oil to drive the probe to do telescopic motion, the valve core is driven to displace through connection of the probe and the valve core, the displacement detection component adopts the magnetostriction displacement detection principle to realize displacement detection of the valve core, and the displacement detection component utilizes the non-contact induction technology principle to measure displacement, so that the measurement accuracy is improved, mechanical abrasion is avoided, and the service life of the whole mechanism is prolonged. Therefore, the displacement detection mechanism is simple in structure, convenient to install and high in reliability.

Further, the displacement detection assembly includes: the displacement detection body is arranged at the left end of the cylinder body, the left end of the measuring rod is fixedly connected with the displacement detection body, the right end of the measuring rod is positioned in the cylinder body, and the cursor magnetic ring is fixedly connected with the left end face of the piston.

Further, the piston comprises a connecting part and a guiding part, the left end of the connecting part is connected with the cursor magnetic ring, the right end of the connecting part is connected with the guiding part, and the right end of the guiding part is connected with the guiding end cover.

Furthermore, through holes are formed in the cursor magnetic ring and the connecting portion, the guide portion is hollow, and the measuring rod penetrates through the cursor magnetic ring and the connecting portion and stretches into the guide portion.

Further, the left end of the probe is fixedly connected with the right end of the guide part.

Further, an elastic piece is sleeved on the measuring rod, the left end of the elastic piece is abutted to the left end face of the cylinder body, and the right end of the elastic piece is abutted to the cursor magnetic ring.

Further, an inner cavity is formed in the piston, an oil through hole is formed in the outer circumferential surface of the piston, the oil through hole is communicated with the inner cavity, and the oil through hole is communicated with the first reversing pilot oil port.

Further, the probe is provided with an oil duct along the axis direction, and the left end of the oil duct is communicated with the inner cavity.

Further, the connecting part of the piston is provided with a plurality of oil guiding and separating grooves along the radial direction.

Further, the inner hole of the guide end cover comprises two anti-rotation planes which are arranged in parallel, and the inner hole of the guide end cover is matched with the outer side wall of the guide part.

The valve core displacement detection mechanism is connected with the valve body to be detected through the connector, the connector is screwed and installed simply through threads, and interference cannot be generated when two adjacent detection mechanisms detect simultaneously; the magnetic ring is not contacted with the measuring rod, so that mechanical abrasion is not generated, the service life of the whole mechanism is prolonged, and the detection precision is improved; the piston is uniformly stressed by arranging the oil guide pressure dividing groove on the piston, so that the displacement detection assembly is driven to stably move; through setting up the elastic component inside the cylinder body, avoided operating personnel's hand to be pressed from both sides the risk of damaging by the elastic component, and make whole size reduce, saved installation space.

Drawings

The utility model will be further described with reference to the drawings and examples.

Fig. 1 is a schematic view of the assembled structure of the present utility model.

FIG. 2 is a schematic diagram of a displacement detecting assembly according to the present utility model.

Fig. 3 is an enlarged schematic view of the structure of the joint of the present utility model.

Fig. 4 is a schematic view of the piston structure of the present utility model.

Fig. 5 is a schematic cross-sectional view of a guide end cap of the present utility model.

In the figure: 1. a cylinder; 11. the first reversing pilot oil port; 2. a displacement detection assembly; 21. a displacement detection body; 22. a measuring rod; 23. a cursor magnetic ring; 24. an elastic member; 3. a guide end cap; 31. an anti-rotation plane; 4. a piston; 41. an inner cavity; 42. oil holes; 43. a connection part; 431. an oil guiding and dividing groove; 44. a guide part; 441. a limit plane; 5. a connector; 6. a probe; 61. an inner hexagonal groove; 62. an oil passage.

Detailed Description

The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only the structures which are relevant to the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 5, the valve core displacement detection mechanism of the multiple directional control valve according to the present embodiment is characterized in that: the device comprises a cylinder body 1, a displacement detection assembly 2, a guide end cover 3, a piston 4, a connector 5 and a probe 6, wherein a first reversing pilot oil port 11 is arranged on the cylinder body 1; the displacement detection assembly 2 is arranged at the left end of the cylinder body 1, and the displacement detection assembly 2 carries out displacement detection by adopting a magnetostriction displacement detection principle; the guide end cover 3 is arranged at the right end of the cylinder body 1; the piston 4 is movably arranged in the cylinder body 1, the left end of the piston 4 is connected with the displacement detection assembly 2, and the right end of the piston 4 is connected with the guide end cover 3; the left end of the connector 5 is connected with the guide end cover 3, and the right end of the connector 5 is connected with the valve body; the probe 6 penetrates through the guide end cover 3 and the connector 5, the left end of the probe 6 is connected with the piston 4, and the right end of the probe 6 is connected with the valve core of the reversing valve.

The pilot pressure oil is injected into the cylinder body 1 through the first reversing pilot oil port 11, the position of the piston 4 in the cylinder body is changed by changing the oil pressure of the pilot pressure oil, the piston 4 drives the probe 6 to do telescopic motion, the probe 6 drives the valve core to displace, and the displacement of the valve core is measured through the displacement detection assembly 2. The connector 5 in this embodiment is a loose nut, and is connected and fixed with the loose nut by using the threaded interface of the valve core end cover, when this embodiment is fastened by screwing the loose nut, the main body of the mechanism does not need to rotate (because the design of the structure size of the multi-way reversing valve is compact, when two paths of adjacent reversing valves are simultaneously installed, the mechanism is radially provided with the reversing pilot oil supply connector and communicated with the first reversing pilot oil port 11), the interference generated by installation can be avoided, and the connector 5 is designed into a detachable and replaceable structure, so that the installation universality of various specifications of threads of the valve core end cover is facilitated, and the valve core end cover is not easy to loosen after long-time use, and the test precision is ensured.

The displacement detection assembly 2 includes: the displacement detection body 21, the measuring rod 22 and the cursor magnetic ring 23, the displacement detection body 21 is arranged at the left end of the cylinder body 1, the left end of the measuring rod 22 is fixedly connected with the displacement detection body 21, the right end of the measuring rod 22 is positioned in the cylinder body 1, and the cursor magnetic ring 23 is fixedly connected with the left end face of the piston 4.

The detection principle of the displacement detection assembly 2 in the embodiment is the working principle of a magnetostrictive displacement sensor, the displacement is measured by utilizing the non-contact induction technology principle, the measurement accuracy is improved, mechanical abrasion is avoided, the service life of the whole mechanism is prolonged, the absolute position of the vernier magnetic ring 23 is accurately converted into a standard 4-20 mA current signal in real time, the output signal and the effective range form a linear relation, the output standard analog signal is directly connected to a PLC module or a PC, and the valve core displacement data is acquired in real time.

The piston 4 comprises a connecting part 43 and a guiding part 44, the left end of the connecting part 43 is connected with the cursor magnetic ring 23, the right end of the connecting part 43 is connected with the guiding part 44, and the right end of the guiding part 44 is connected with the guiding end cover 3. The cursor magnetic ring 23 and the connecting part 43 are respectively provided with a through hole, the guide part 44 is hollow, and the measuring rod 22 penetrates through the cursor magnetic ring 23 and the connecting part 43 and stretches into the guide part 44. The left end of the probe 6 is fixedly connected to the right end of the guide 44. For the tested multi-way reversing valve of different types, the initial position and the stroke of the valve core are different, so that the lengths of the corresponding probes 6 are correspondingly different, the probes 6 and the guide parts 44 of the embodiment are in threaded connection, the probes 6 with different lengths are convenient to replace, the contact end surfaces of the probes 6 and the valve core are of an inner hexagonal groove 61 structure, the connection of the probes 6 and the guide parts 44 is used for fastening, and the probes 6 and the piston 4 are convenient to completely fasten and do not loosen.

The measuring rod 22 is sleeved with an elastic piece 24, the left end of the elastic piece 24 is abutted with the left end face of the cylinder body 1, and the right end of the elastic piece 24 is abutted with the cursor magnetic ring 23. The piston 4 is provided with an inner cavity 41, the outer circumferential surface of the piston 4 is provided with an oil through hole 42, the oil through hole 42 is communicated with the inner cavity 41, and the oil through hole 42 is communicated with the first reversing pilot oil port 11. The probe 6 is provided with an oil passage 62 along the axial direction, and the left end of the oil passage 62 is communicated with the inner cavity 41.

The elastic piece 24 of this embodiment is the spring, and the elastic piece 24 sets up in cylinder body 1, is difficult to press from both sides the hand of damaging operating personnel in the compression process, has improved the security to impurity such as iron fillings also are difficult to pollute and wearing and tearing measuring staff, have improved measurement accuracy, and through setting up the size of whole testing mechanism in cylinder body 1 with the elastic piece 24, have saved test space. When the first reversing pilot oil port 11 injects pilot pressure oil into the cylinder body 1, the pilot pressure oil enters the inner cavity 41 through the oil through hole 42, and the pilot pressure oil in the inner cavity 41 is transmitted to the contact end surface of the valve core through the oil duct 62, so that the valve core is pushed to move rightwards, and the piston 4, the vernier magnetic ring 23 and the probe 6 are driven to move rightwards synchronously. In the moving process, the relative positions of the vernier magnetic ring 23 and the measuring rod 22 are changed, so that the real-time displacement of the valve core can be measured in a non-contact induction manner, and the generated analog electric signal is transmitted to the acquisition system. Because the pressure value of the pilot pressure oil can be steplessly adjusted, the valve core can also steplessly move in the effective stroke range of the valve body, and the displacement value of the valve core can be detected in real time in the whole detection process and recorded and stored by the acquisition system.

In addition, the left end of the valve core is connected with the probe, and a second pilot oil port is arranged on an end cover at the right end of the valve core. The pilot pressure oil is injected into the cylinder 1 through the first pilot oil port 11 to move the valve element rightward and displace the valve element, which is defined as a direction change a, and when the valve element needs to move leftward, the pilot pressure oil is injected through the second pilot oil port, which is defined as a direction change b. The effective stroke of the embodiment covers the left-right bidirectional movement range of the tested valve core, namely, when the valve core is in an initial state (the valve core is in the middle position of the valve body), the elastic piece 24 is compressed by 50%, in this state, the relative position (marked as position O) of the vernier magnetic ring 23 and the measuring rod 22 is 50% of the self range of the displacement detection assembly 2, namely, the range of the position O to the right 50% is the total displacement stroke of the reversing of the tested valve core a, and the range of the position O to the left 50% is the total displacement stroke of the reversing of the tested valve core b. Therefore, the mounting position and direction of the displacement detection mechanism are not required to be changed when the valve core is reversed, the problem of detecting the bidirectional displacement of the valve core is effectively solved, and the bidirectional displacement of the valve core can be detected at the same time only by mounting the embodiment on one side of the valve core end cover, and the relative displacement value of the valve core is detected.

The connecting portion 43 of the piston 4 is provided with a plurality of oil guide pressure grooves 431 in the radial direction. The piston 4 is fixed with the cursor magnetic ring 23 through screws, a plurality of oil guide pressure dividing grooves 431 are formed in the connecting portion 43 along the radial direction, and the plurality of oil guide pressure dividing grooves 431 are uniformly distributed along the circumferential direction, so that the stress is uniform under the effect of pilot pressure oil, when the cursor magnetic ring 23 moves along with the piston 4, the outer wall of the cursor magnetic ring 23 is not contacted with the inner wall of the cylinder body 1, the inner wall of the cursor magnetic ring 23 is not contacted with the outer wall of the measuring rod 22, and even if the cursor magnetic ring 23 does not contact with the outer wall of the measuring rod 22, the cursor magnetic ring 23 moves in the axial direction within the effective measuring range of the measuring rod 22, the process reduces the unbalanced friction resistance of the cursor magnetic ring 23, and the movement is smoother.

The inner hole of the guide end cover 3 comprises two anti-rotation planes 31 which are arranged in parallel, and the inner hole of the guide end cover 3 is matched with the outer side wall of the guide part 44. The lateral wall of the guiding part 44 is surrounded by two upper and lower arc surfaces and two parallel limiting planes 441 in the middle, the two arc surfaces are in transitional connection through the two parallel limiting planes 441, the two parallel limiting planes 441 in the middle of the guiding part 44 are matched with the two anti-rotation planes 31, and when the piston 4 and the guiding end cover 3 are guided in a clearance fit manner, the two anti-rotation planes 31 of the guiding end cover 3 also have the function of preventing the piston 4 from rotating radially.

In summary, the displacement detection assembly 2 adopts the magnetostrictive displacement detection principle to realize the displacement detection of the valve core, and the displacement detection assembly 2 measures the displacement by utilizing the non-contact induction technology principle, so that the measurement accuracy is improved, mechanical abrasion is avoided, and the service life of the whole mechanism is prolonged; by arranging the elastic piece 24 in the cylinder body 1, the elastic piece 24 is not easy to pinch the hands of operators in the compression process, the safety is improved, impurities such as scrap iron are not easy to pollute and abrade the measuring rod, and the measurement accuracy is improved; and the elastic piece 24 is arranged in the cylinder body 1, so that the size of the whole testing mechanism is reduced, and the testing space is saved; the connector 5 is the live nut, and when this embodiment is fastened through live nut soon, the main part of mechanism need not to rotate and can avoid the interference that the installation produced to the connector 5 designs into removable structure, the installation commonality of the various specification screw thread of case end cover of being convenient for, and uses for a long time and be difficult to loosen and take off, has guaranteed the precision of test.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined as the scope of the claims.

Claims

1. The utility model provides a case displacement detection mechanism of multiple direction valve which characterized in that: comprising

The hydraulic control system comprises a cylinder body (1), wherein a first reversing pilot oil port (11) is arranged on the cylinder body (1);

The displacement detection assembly (2), the displacement detection assembly (2) is arranged at the left end of the cylinder body (1), and the displacement detection assembly (2) adopts a magnetostriction displacement detection principle to carry out displacement detection;

the guide end cover (3) is arranged at the right end of the cylinder body (1);

the piston (4) is movably arranged in the cylinder body (1), the left end of the piston (4) is connected with the displacement detection assembly (2), and the right end of the piston (4) is connected with the guide end cover (3);

The left end of the connector (5) is connected with the guide end cover (3), and the right end of the connector (5) is connected with the valve body;

The probe (6), the probe (6) runs through direction end cover (3) and connector (5), the left end of probe (6) is connected with piston (4), the right-hand member of probe (6) is connected with the case of switching-over valve.

2. The spool displacement detection mechanism of a multiple directional control valve according to claim 1, wherein: the displacement detection assembly (2) comprises: displacement detects body (21), measuring staff (22) and cursor magnetic ring (23), displacement detects body (21) set up the left end at cylinder body (1), the left end and the displacement of measuring staff (22) detect body (21) fixed connection, the right-hand member of measuring staff (22) is located cylinder body (1), cursor magnetic ring (23) with the left end face fixed connection of piston (4).

3. The spool displacement detection mechanism of a multiple directional control valve according to claim 2, characterized in that: the piston (4) comprises a connecting part (43) and a guiding part (44), wherein the left end of the connecting part (43) is connected with the cursor magnetic ring (23), the right end of the connecting part (43) is connected with the guiding part (44), and the right end of the guiding part (44) is connected with the guiding end cover (3).

4. The spool displacement detection mechanism of a multiple directional control valve according to claim 3, wherein: the vernier magnetic ring (23) and the connecting part (43) are respectively provided with a through hole, the guide part (44) is hollow, and the measuring rod (22) penetrates through the vernier magnetic ring (23) and the connecting part (43) and stretches into the guide part (44).

5. The spool displacement detection mechanism of a multiple directional control valve according to claim 4, wherein: the left end of the probe (6) is fixedly connected with the right end of the guide part (44).

6. The spool displacement detection mechanism of a multiple directional control valve according to claim 5, wherein: an elastic piece (24) is sleeved on the measuring rod (22), the left end of the elastic piece (24) is abutted to the left end face of the cylinder body (1), and the right end of the elastic piece (24) is abutted to the cursor magnetic ring (23).

7. The spool displacement detection mechanism of a multiple directional control valve according to claim 6, wherein: the piston (4) is provided with an inner cavity (41), the outer circumferential surface of the piston (4) is provided with an oil through hole (42), the oil through hole (42) is communicated with the inner cavity (41), and the oil through hole (42) is communicated with the first reversing pilot oil port (11).

8. The spool displacement detection mechanism of a multiple directional control valve according to claim 7, wherein: the probe (6) is provided with an oil duct (62) along the axial direction, and the left end of the oil duct (62) is communicated with the inner cavity (41).

9. The spool displacement detection mechanism of a multiple directional control valve according to claim 8, wherein: a plurality of oil guide pressure grooves (431) are formed in the radial direction in the connecting portion (43) of the piston (4).

10. The spool displacement detection mechanism of a multiple directional control valve according to claim 9, wherein: the inner hole of the guide end cover (3) comprises two anti-rotation planes (31) which are arranged in parallel, and the inner hole of the guide end cover (3) is matched with the outer side wall of the guide part (44).