Pilot hydraulic handle electromagnet control circuit and pilot hydraulic handle

Abstract

The utility model relates to the related technical field of pilot hydraulic handle control circuits, and provides a pilot hydraulic handle electromagnet control circuit and a pilot hydraulic handle, the control circuit comprises a first switch, a limit switch, a first normally closed contact relay, a second normally open contact relay and a controlled positioning valve which are connected in sequence; after a normally closed contact switch of the first normally closed contact relay and a normally open contact switch of the second normally open contact relay are connected in series, one end is connected with a power supply, and the other end is connected to a controlled positioning valve; a coil of the first normally-closed contact relay is connected with the limit switch, and a coil of the second normally-open contact relay is connected with the output end of the first switch. By designing the logic circuit of the handle pilot function, opening and closing of the handle pilot function can be achieved, and the same circuit meets different function requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of pilot hydraulic handle control circuits, in particular to a pilot hydraulic handle electromagnet control circuit and a pilot hydraulic handle. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, loaders have a handle pilot engagement function, also known as an electromagnet engagement function. That is, when the pilot handle is turned to a specific position, the electromagnet is energized and the boom is automatically raised to the highest position and the bucket is leveled. However, different customers in the market have different requirements for this function. Some customers do not need the handle pilot engagement function. This increases the product variety. Based on customer requirements, two types of loader pilot handles are designed, one with a pilot engagement function and the other without. This increases the production cost of the product. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a pilot hydraulic handle electromagnet control circuit and a pilot hydraulic handle. A control circuit is set on a loader with an original handle pilot suction function to control the removal and input of the handle pilot function, which can meet the requirements of different customers. Different pilot handle requirements can be met through one pilot handle.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] One or more embodiments provide a pilot hydraulic handle solenoid control circuit, comprising a first switch, a limit switch, a first normally closed contact relay, a second normally open contact relay, and a controlled positioning valve connected in sequence;

[0007] The normally closed contact switch of the first normally closed contact relay and the normally open contact switch of the second normally open contact relay are connected in series, one end of which is connected to a power supply, and the other end is connected to a controlled positioning valve;

[0008] The coil of the first normally closed contact relay is connected to the limit switch, and the coil of the second normally open contact relay is connected to the output end of the first switch.

[0009] One or more embodiments provide a pilot hydraulic handle that employs the above-mentioned pilot hydraulic handle electromagnet control circuit.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] The utility model realizes the handle pilot function through the control circuit of two relays. When the first switch K3 is closed, the second normally open contact relay is turned on, the electromagnet in the controlled positioning valve is energized and attracted, the relay is energized, and the loader performs the corresponding action. After the corresponding action is performed through the set limit switch, etc., the electromagnet in the controlled positioning valve is controlled to be disconnected, so that the positioning valve is energized and then disconnected after the bucket or boom moves, thus realizing the handle pilot function; when the first switch K3 is disconnected, the electromagnet in the controlled positioning valve is not energized, the first normally closed contact relay and the second normally open contact relay are both not energized, and the loader does not move, that is, there is no handle pilot function.

[0012] The utility model can realize the opening and closing of the handle pilot function by designing a logic circuit of the handle pilot function, and the same circuit meets different functional requirements.

[0013] The advantages of the present invention and additional advantages will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute a limitation of the present invention.

[0015] Figure 1 This is a circuit diagram of the pilot hydraulic handle electromagnet control circuit of Example 1 of the present utility model; DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0018] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0019] In the technical solutions disclosed in one or more embodiments, Figure 1As shown, a pilot hydraulic handle electromagnet control circuit includes a first switch K3, a limit switch, a first normally closed contact relay, a second normally open contact relay and a controlled positioning valve connected in sequence;

[0020] The normally closed contact switch of the first normally closed contact relay and the normally open contact switch of the second normally open contact relay are connected in series, one end of which is connected to a power supply, and the other end is connected to a controlled positioning valve;

[0021] The coil of the first normally closed contact relay is connected to the limit switch, and the coil of the second normally open contact relay is connected to the output end of the first switch K3;

[0022] In this embodiment, the handle pilot function is realized through the control circuit of two relays. When the first switch K3 is closed, the second normally open contact relay is turned on, the electromagnet in the controlled positioning valve is energized and attracted, and the relay is energized to set the vehicle (such as a loader) with the handle to perform the corresponding action. After the corresponding action is performed through the set limit switch, etc., the electromagnet in the controlled positioning valve is controlled to be disconnected, so that the bucket or boom moves after the positioning valve is energized and then disconnected, that is, the handle pilot function is realized; when the first switch K3 is disconnected, the electromagnet in the controlled positioning valve is not energized, the first normally closed contact relay and the second normally open contact relay are both not energized, and the loader does not move, that is, there is no handle pilot function.

[0023] In this embodiment, by designing a logic circuit of the handle pilot function, the handle pilot function can be turned on and off, and the same circuit meets different functional requirements.

[0024] Specifically, the first switch K3 is connected to the power supply, and the handle suction and discharge function is controlled by turning the switch on and off, that is, the handle suction and discharge function switch, which can be set as a manual switch or an electronic switch.

[0025] Optionally, the electronic switch is connected to a controller of the vehicle to which the handle belongs, and on-off control is performed by the controller.

[0026] In some embodiments, a limit switch, a first normally closed contact relay, a second normally open contact relay, and a controlled positioning valve are sequentially connected to form a control branch, and the number of control branches is set according to the pilot function of the handle;

[0027] Optionally, the handle pilot function in this embodiment includes an automatic lifting function and / or an automatic bucket leveling function, and corresponding control branches are set accordingly; wherein the automatic lifting function is used to achieve positioning after the boom is lifted to a high position;

[0028] Specifically, the limit switches include the boom high limit switch K1 and the bucket leveling limit switch K2; the first normally closed contact relay includes the boom high limit relay KC3 and the bucket leveling relay KC4; the second normally open contact relay includes the high limit function relay KC1 and the leveling function relay KC2; the controlled positioning valves include the boom high position positioning valve T1 and the bucket leveling positioning valve T2;

[0029] Among them, the boom high limit switch K1, boom high limit relay KC3, high limit function relay KC1, and boom high position positioning valve T1 are connected in sequence to form a control branch for controlling the automatic lifting of the boom;

[0030] The bucket leveling limit switch K2, bucket leveling relay KC4, leveling function relay KC2, and bucket leveling positioning valve T2 are connected in sequence to form a control branch for automatically leveling the bucket;

[0031] Optionally, the limit switch is specifically a proximity switch, which can be an eddy current proximity switch, a capacitive proximity switch or a photoelectric switch;

[0032] In order to improve the safety of the circuit, a fuse F is provided on the path connecting the first switch K3 to the power supply. The rated current of the fuse F may be 20A.

[0033] Furthermore, a first diode is connected in parallel at both ends of the controlled positioning valve to achieve reverse connection protection; optionally, the first diode model may be IN5408;

[0034] Furthermore, a second diode is connected in parallel at both ends of the relay coil to protect the relay; optionally, the second diode model may be IN5408;

[0035] The working process of the above control circuit is described below;

[0036] Currently, loaders have a pilot handle electromagnet engagement function, which automatically raises the boom to its highest position and levels the bucket when the pilot handle is moved to a specific position. However, different customers in the market have different requirements for this function. This embodiment uses a circuit control logic and a rocker switch to control the pilot handle engagement function, meeting the needs of different customers.

[0037] The opening and closing of the handle pilot suction function is controlled by the first switch K3 that realizes the handle suction function. When the first switch K3 is closed, the boom high limit switch K1 and the bucket leveling limit switch K2 are energized. At the same time, the control ends of the high limit function relay KC1 and the leveling function relay KC2 are energized, and the controlled ends are energized. The high limit positioning valve T1 and the bucket leveling positioning valve T1 are always in the energized state. When the handle is pulled to a specific position, the positioning valve is energized. When the boom reaches the highest position or the bucket is leveled, the limit switches K1 and K2 respectively output signals, the boom high limit relay KC3 and the bucket leveling relay KC4 are energized, the corresponding normally closed switches are disconnected, the power supply of the limit valves T1 and T2 is disconnected, the handle suction is released, and the handle pilot suction function is realized;

[0038] When the first switch K3 is disconnected, the power supply to the boom high limit switch K1 and the bucket leveling limit switch K2 is cut off. At the same time, because the high limit function relay KC1 and the leveling function relay KC2 are normally open relays, the handle positioning valve is not energized and the handle pilot suction function fails.

[0039] Example 2

[0040] Based on Example 1, this embodiment provides a pilot hydraulic handle, which adopts the pilot hydraulic handle electromagnet control circuit described in Example 1.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0042] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A pilot hydraulic handle solenoid control circuit, characterized in that: It includes a first switch, a limit switch, a first normally closed contact relay, a second normally open contact relay and a controlled positioning valve which are connected in sequence; The normally closed contact switch of the first normally closed contact relay and the normally open contact switch of the second normally open contact relay are connected in series, one end of which is connected to a power supply, and the other end is connected to a controlled positioning valve; The coil of the first normally closed contact relay is connected to the limit switch, and the coil of the second normally open contact relay is connected to the output end of the first switch.

2. A pilot hydraulic handle solenoid control circuit as claimed in claim 1, characterized in that: The first switch is connected to a power source, and the suction and discharge functions of the handle are controlled by turning the switch on and off.

3. A pilot hydraulic handle solenoid control circuit as claimed in claim 1, characterized in that: The first switch is a manual switch or an electronic switch.

4. A pilot hydraulic handle solenoid control circuit as claimed in claim 3, characterized in that: The electronic switch is connected to a controller of the vehicle to which the handle belongs, and is controlled on and off by the controller.

5. A pilot hydraulic handle solenoid control circuit as claimed in claim 1, characterized in that: The limit switch, the first normally closed contact relay, the second normally open contact relay and the controlled positioning valve connected in sequence form a control branch, and the number of the control branches is set according to the pilot function of the handle.

6. A pilot hydraulic handle solenoid control circuit as claimed in claim 5, characterized in that: The handle pilot function includes an automatic lifting function and / or an automatic bucket leveling function, and corresponding control branches are set.

7. A pilot hydraulic handle solenoid control circuit as claimed in claim 5, characterized in that: The limit switches include the boom high position limit switch K1 and the bucket leveling limit switch K2; The first normally closed contact relay includes the boom high limit relay KC3 and the bucket leveling relay KC4; The second normally open contact relay includes a high limit function relay KC1 and a leveling function relay KC2; The controlled positioning valves include the boom high position positioning valve T1 and the bucket leveling positioning valve T2.

8. A pilot hydraulic handle solenoid control circuit as claimed in claim 7, characterized in that: The boom high position limit switch K1, the boom high position limit relay KC3, the high position limit function relay KC1, and the boom high position positioning valve T1 are connected in sequence to form a control branch for controlling the automatic lifting of the boom; Alternatively, the bucket leveling limit switch K2, the bucket leveling relay KC4, the leveling function relay KC2, and the bucket leveling positioning valve T2 are connected in sequence to form a control branch for controlling the automatic leveling of the bucket.

9. A pilot hydraulic handle solenoid control circuit as claimed in claim 1, characterized in that: The limit switch is specifically a proximity switch, which adopts an eddy current proximity switch, a capacitive proximity switch or a photoelectric switch; Alternatively, a first diode is connected in parallel at both ends of the controlled positioning valve; Alternatively, a second diode is connected in parallel across the coil of the relay.

10. A pilot hydraulic handle, characterized in that: A pilot hydraulic handle solenoid control circuit as described in any one of claims 1 to 9 is adopted.

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