Electric proportional valve equipment convenient for troubleshooting

Abstract

The utility model provides electric proportional valve equipment convenient for troubleshooting. The electric proportional valve equipment comprises a valve body, integrated components and a liquid flow channel, the valve element is arranged in the valve body pressure measuring sealing cover and is in sliding connection with the liquid channel. The spring cover assembly is detachably connected with one side of the valve body, and a spring seat is arranged in the spring cover assembly and matched with a spring set to be connected with the valve element. The displacement measuring assembly can replace the spring cover assembly to be connected with the valve body and is used for detecting the displacement of the valve element; and the proportional electromagnetic valve is arranged at the bottom of the valve body and is used for controlling the movement of the valve core. The equipment is used for solving the technical problems that the displacement of a main valve element is difficult to test in the application of an existing electric proportional valve structure, and if a control system cannot sense the actual displacement of the main valve element, internal faults cannot be eliminated and detected after a valve body breaks down.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of electric proportional valves, and in particular to electric proportional valve equipment which is convenient for troubleshooting. Background Art

[0002] The current electro-proportional hydraulic reversing valve uses an electromagnet to directly drive the main valve core or drive a pilot hydraulic pressure reducing valve to indirectly drive the main valve core, proportionally adjusting the amount of hydraulic oil to drive the equipment and obtain the required speed. However, in both methods, both end surfaces of the main valve core are completely immersed in oil and connected to the hydraulic oil tank, which is a "completely closed" space from the outside world, making it impossible to universally monitor the displacement of the valve core.

[0003] The inventor discovered the following defects during the operation of the specific embodiment:

[0004] It is difficult to test the displacement of the main valve core in the above structure during application. If the control system cannot sense the actual displacement of the main valve core, it is impossible to eliminate the internal fault after the valve body fails.

[0005] It should be noted that the above contents belong to the technical cognition scope of the inventor. Since the technical contents in this field are vast and too complicated, the above contents of this application do not necessarily constitute prior art. Utility Model Content

[0006] 1. Technical problems to be solved by the utility model:

[0007] The utility model provides an electric proportional valve device which is convenient for troubleshooting, so as to solve the technical problems existing in the above-mentioned background technology.

[0008] 2. Technical solution:

[0009] To achieve the above-mentioned purpose, the technical solution provided by the utility model is as follows: an electric proportional valve equipment that is easy to troubleshoot, a valve body, integrated components and provided with a liquid flow channel; a valve core, arranged inside the valve body, and slidably connected with the liquid channel; a spring cover assembly, detachably connected to one side of the valve body, with a spring seat inside that cooperates with a spring and is connected to the valve core; a displacement measuring assembly, which can replace the spring cover assembly and is connected to the valve body, and is used to detect the displacement of the valve core;

[0010] The proportional solenoid valve is arranged at the bottom of the valve body and is used to control the movement of the valve core.

[0011] Furthermore, the displacement measuring assembly comprises an elongated rod, the inner end of the elongated rod is threadedly connected to the valve core, the outer end of the elongated rod and the pressure measuring sealing cover form a sliding pair, and the pressure measuring sealing cover is detachably connected to the side of the valve core.

[0012] Furthermore, a grid ring is provided at the sliding junction between the pressure measuring sealing cover and the elongated rod.

[0013] Furthermore, a pressure measuring and reversing handle assembly is provided on the other side of the valve body to control the movement of the valve core.

[0014] Furthermore, a first pressure measuring port is provided on the pressure measuring reversing handle assembly, and a second pressure measuring port is provided on the pressure measuring sealing cover.

[0015] Furthermore, the four corners of the pressure measuring sealing cover are connected to the valve body by screws.

[0016] Furthermore, the elongated rod is provided with a hexagonal process step.

[0017] 3. Beneficial effects:

[0018] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0019] The utility model has a reasonable design. Through mechanical rigid connection, the hard-to-read main valve core displacement parameter is converted into the extension rod displacement parameter. The displacement sensor or piezoelectric sensor is used to detect and feed back to the controller, so that the fault detection of the electric proportional valve can be convenient and fast.

[0020] The extended rod is sealed with a Gly ring, which has low friction and hardly affects the movement performance of the main valve core, effectively reflecting the displacement parameter characteristics of the main valve core.

[0021] By connecting the two pressure measuring ports to the pressure sensor and reading the parameters, it is possible to determine whether the pilot system has a fault.

[0022] It should be noted that the structures not introduced in the present invention are not related to the design points and improvement directions of the present invention, and are the same as the prior art or can be implemented by using the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the pressure measuring sealing cover of the utility model when it is opened;

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0026] Figure 4 It is a schematic diagram of the prior art structure;

[0027] Figure 5 Schematic diagram of flow-displacement curve measured in the embodiment;

[0028] Figure 6 Schematic diagram of displacement-current curve measured in the embodiment;

[0029] Figure 7 Schematic diagram of the flow-current curve measured in the embodiment;

[0030] Figure 8 One of the schematic diagrams of the pilot curve runout diagram measured in the embodiment;

[0031] Fig. 9 This is the second schematic diagram of the pilot curve runout diagram measured in the embodiment.

[0032] Reference numerals:

[0033] 1. Valve body; 2. Valve core; 3. Displacement measurement assembly; 31. Extension rod; 32. Pressure measuring sealing cover; 33. Gly ring; 34. Second pressure measuring port; 35. Hexagonal process step; 5. Pressure measuring reversing handle assembly; 51. First pressure measuring port; 4. Proportional solenoid valve. DETAILED DESCRIPTION

[0034] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiment Refer to the attached Figure 1-9 , an electric proportional valve device convenient for troubleshooting, comprising

[0039] A valve body 1, which integrates components and is provided with a liquid flow channel;

[0040] The valve core 2 is arranged inside the valve body 1 and is slidably connected with the liquid channel;

[0041] A spring cover assembly is detachably connected to one side of the valve body 1, and is provided with a spring seat inside to cooperate with a spring group and connect with the valve core 2;

[0042] A displacement measuring assembly 3, which can replace the spring cover assembly and be connected to the valve body 1, and is used to detect the displacement of the valve core 2;

[0043] The proportional solenoid valve 4 is disposed at the bottom of the valve body 1 and is used to control the movement of the valve core 2 .

[0044] The spring cover assembly and the displacement measuring assembly 3 of the device can be replaced. After the electric proportional valve is produced or when the electric proportional valve fails after being used for a period of time, the displacement measuring assembly 3 can be installed on one side of the valve body 1 to perform fault inspection and judgment. During normal use, the spring cover assembly is connected to the valve body 1. The spring cover assembly is not drawn in the attached figure. With reference to the spring cover assembly of the prior art, no further description is given here. When inspection or troubleshooting is required, the screws at the four corners of the spring cover assembly are removed, and the displacement measuring assembly 3 is connected to the valve body 1. The proportional solenoid valve 4 is controlled to move the valve core 2. By reading the displacement parameters of the valve core itself, a curve diagram of displacement L and current I, flow Q and displacement L is drawn to confirm the fault occurrence system. Generally, the following situations exist:

[0045] 1. If the linearity and coincidence of the two curves are qualified, it means that the fault point is not in the main valve core 2 system.

[0046] 2. If the displacement-current curve itself has poor linearity and low overlap, and fails to meet the requirements, but the flow-displacement curve has good linearity and high overlap, it means that the fault lies in the matching factor of the valve core 2 and valve body 1 in the main valve core 2 system.

[0047] 3. If the linearity and overlap of the displacement-current curve itself are qualified, but the linearity of the flow-displacement curve is poor and the overlap is high, it means that the fault point lies in the imperfect structural design of the main valve core 2 system or the poor processing of the valve stem gear of the valve body 1.

[0048] 4. If only the flow-displacement curve has a low overlap, it means that the fault point lies in the two-way compensation valve system.

[0049] 5. If only the flow-displacement curve has a high overlap, it means that the fault point is the main valve core 2 and the entire system is faulty. The specific measurement results can be referred to Figure 5 , 6 7. In this embodiment, comprehensive analysis shows that the fault point is that the entire main valve core 2 system is faulty.

[0050] 6. If the data are not qualified, it means there is a fault.

[0051] Therefore, after the electric proportional valve fails or before leaving the factory, the device can be used to quickly determine the fault point by connecting the displacement measuring component 3 with the valve core 2 and then testing it, and then arrange corresponding repairs. After the repair is successful, the spring cover component can be installed again for normal use.

[0052] Of course, it should be noted that the displacement measuring component 3 can also be connected to different proportional valves and is not limited to Figure 1 The electric proportional valve in the embodiment can also be adapted to other valve bodies 1 with similar structures for controlling flow by moving the valve core 2.

[0053] The displacement measuring assembly 3 includes an extension rod 31, the inner end of the extension rod 31 is threadedly connected to the valve core 2, the outer end of the extension rod 31 and the pressure measuring sealing cover 32 form a sliding pair, and the pressure measuring sealing cover 32 is detachably connected to the side of the valve core 2. In this embodiment, when the displacement measuring assembly 3 needs to be installed, the spring cover assembly on the side of the valve core 2 is first removed, and the extension rod 31 is inserted into the middle of the valve core 2. Finally, the middle hole of the pressure measuring sealing cover 32 is aligned with the extension rod 31 and inserted inward to connect with the valve core 2. Subsequently, the corresponding displacement sensor is connected to the outside of the extension rod 31, and the difficult-to-read displacement parameters of the main valve core 2 are converted into displacement parameters of the extension rod 31, which are detected by a displacement sensor or a piezoelectric sensor and fed back to the controller.

[0054] A grid ring 33 is provided at the sliding junction between the pressure measuring sealing cover 32 and the elongated rod 31. The grid ring 33 is used for sealing, and the friction force is small, which hardly affects the movement performance of the main valve core 2 and effectively reflects the displacement parameter characteristics of the main valve core 2.

[0055] A pressure measuring reversing handle assembly 5 is provided on the other side of the valve body 1 for backing up the movement of the valve core 2. When the internal valve core fails to move, the position of the valve core can be manually adjusted by rotating the pressure measuring reversing handle, so as to temporarily solve the problem.

[0056] The pressure measuring reversing handle assembly 5 is provided with a first pressure measuring port 51, and the side of the pressure measuring sealing cover 32 is provided with a second pressure measuring port 34. The first pressure measuring port 51 and the second pressure measuring port 34 are respectively connected to the two ends of the valve core 2, and the first pressure measuring port 51 and the second pressure measuring port 34 are respectively connected to the pressure sensor. By reading the pressure of the pilot control cavity of the valve core 2, a curve graph of the pilot pressure Pa / b and the feedback current I is drawn. According to the curve graph, it is judged whether the pilot system has a fault, which is divided into the following situations;

[0057] 1. Reference Figure 8 The unit of the vertical axis in the figure is MPa. When the "0-100% command curve" and the "100-0% command curve" in the curve graph have a high degree of overlap and good linearity, it can be judged that the pilot system has no fault.

[0058] 2. When the "0-100% command curve" and the "100-0% command curve" in the curve chart do not overlap highly, it means that the pilot system itself has a hysteresis problem.

[0059] 3. Reference Fig. 9 The vertical axis unit in the figure is MPa. When the curve in the figure jumps and is messy, and the entire valve system also shakes and makes abnormal noises, it means that the pilot proportional pressure reducing valve is faulty.

[0060] The four corners of the pressure measuring sealing cover 32 are connected to the valve body 1 by screws, which is convenient for the connection and disassembly of the pressure measuring sealing cover 32. It should be noted that, in this embodiment, other forms of detachable connection can also be used to connect the pressure measuring sealing cover 32, such as snap connection, clamping, etc., and screw connection is not the only limitation of this application.

[0061] The extension rod 31 is provided with a hexagonal process step 35, and the hexagonal nut 35 facilitates the threaded connection between the extension rod 31 and the valve core 2. It should be noted that other forms of process steps that are convenient for installation can also be used on the extension rod 31. The main purpose is to facilitate the extension rod 31 to be screwed in with the corresponding tool. This embodiment is not the only limitation.

[0062] The above-described embodiments only express a certain implementation method of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the patent of the utility model shall be based on the attached claims.

Claims

1. An electric proportional valve device that is easy to troubleshoot, its characteristics include: A valve body (1) is provided with integrated components and a liquid flow channel; A valve core (2) is disposed inside the valve body (1) and is slidably connected to the liquid channel; A spring cover assembly is detachably connected to one side of the valve body (1), and is provided with a spring seat inside thereof for cooperating with a spring assembly and connecting to the valve core (2); A displacement measuring assembly (3) can replace the spring cover assembly and be connected to the valve body (1) to detect the displacement of the valve core (2); A proportional solenoid valve (4) is provided at the bottom of the valve body (1) and is used to control the movement of the valve core (2).

2. The electric proportional valve equipment for facilitating troubleshooting according to claim 1, characterized in that: The displacement measuring assembly (3) comprises an elongated rod (31), the inner end of the elongated rod (31) being threadedly connected to the valve core (2), the outer end of the elongated rod (31) forming a sliding pair with a pressure measuring sealing cover (32), and the pressure measuring sealing cover (32) being detachably connected to the side of the valve core (2).

3. The electric proportional valve equipment for facilitating troubleshooting according to claim 2, characterized in that: A grid ring (33) is provided at the sliding junction between the pressure measuring sealing cover (32) and the elongated rod (31).

4. The electric proportional valve equipment for facilitating troubleshooting according to claim 2, characterized in that: A pressure measuring reversing handle assembly (5) is provided on the other side of the valve body (1) to control the movement of the valve core (2).

5. The electric proportional valve equipment for facilitating troubleshooting according to claim 4, characterized in that: The pressure measuring reversing handle assembly (5) is provided with a first pressure measuring port (51), and the pressure measuring sealing cover (32) is provided with a second pressure measuring port (34).

6. The electric proportional valve equipment for facilitating troubleshooting according to claim 2, characterized in that: The four corners of the pressure measuring sealing cover (32) are connected to the valve body (1) via screws.

7. The electric proportional valve equipment for facilitating troubleshooting according to claim 2, characterized in that: The elongated rod (31) is provided with a hexagonal process step (35).

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