A manual / automatic hydraulic relief valve with a handle to prevent accidental touch.

Abstract

This utility model discloses a manual-automatic hydraulic relief valve with an anti-accidental touch handle. It relates to the field of hydraulic relief valve technology and includes a main valve, a pilot pressure regulating valve, a two-position two-way directional valve, a directional valve return spring, an electromagnetic coil, and a relief valve pressure adjusting screw. It also includes an anti-accidental touch manual reversing device disposed between the two-position two-way directional valve and the electromagnetic coil. In the non-operational state, the handle of this manual-automatic hydraulic relief valve is separated from the handle drive shaft by the return spring. Rotating the handle at this time only causes the drive sleeve to rotate freely and cannot drive the valve core, effectively preventing accidental hydraulic system reversal caused by accidental touch or rotation of the handle, thus preventing equipment damage or safety hazards caused by operational errors. The handle must be pressed down to engage with the drive shaft, forming a dual "press-rotate" operation logic, clearly defining the operation trigger condition, reducing the probability of unexpected operation, and providing safety for operators and equipment.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic relief valve technology, specifically a manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle. Background Technology

[0002] In hydraulic systems, to protect the hydraulic pump and motor during startup, the hydraulic system needs to be in a zero-pressure, zero-load state. However, in actual production, due to complex factory conditions, power outages and damage to the solenoid coil may occur, making it impossible to control the movement of the 2-position 2-way directional valve spool. This prevents the hydraulic pump outlet oil from completely overflowing through the overflow port, causing the hydraulic pump motor to be under high load during startup. This can easily lead to malfunctions such as the hydraulic pump failing to start or the hydraulic pump motor overloading and tripping, affecting the normal use and production of the hydraulic system. Therefore, this invention provides a manual / automatic integrated hydraulic overflow valve with an anti-accidental touch handle to solve the aforementioned problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a manual-automatic integrated hydraulic relief valve with an anti-accidental touch handle, including a main valve, a pilot pressure regulating valve, a two-position two-way reversing valve, a reversing valve return spring, an electromagnetic coil and a relief valve pressure regulating screw, and also includes an anti-accidental touch manual reversing device disposed between the two-position two-way reversing valve and the electromagnetic coil. The anti-accidental touch manual reversing device is used to realize the manual reversing of the two-position two-way reversing valve, and has the function of preventing accidental touch in the non-operation state. It can ensure the hydraulic pump starts with zero pressure and zero load when the electromagnetic coil fails and loses power.

[0005] Preferably, the anti-accidental touch manual reversing device includes a manual device housing, a handle drive shaft rotatably mounted on the manual device housing, and a reversing valve core lever linked to the handle drive shaft for moving the reversing valve core of the two-position two-way reversing valve. The reversing valve core is extended to adapt to the connection with the reversing valve core lever.

[0006] Preferably, the anti-accidental touch manual reversing device further includes a handle drive sleeve fitted outside the handle drive shaft, a handle movably inserted inside the handle drive sleeve, and a handle return spring fitted inside the handle drive sleeve and applying an elastic return force to the handle. When not in operation, the handle remains separated from the handle drive shaft under the action of the handle return spring.

[0007] Preferably, the handle drive shaft has a handle insertion hole at one end corresponding to the handle. Pressing down the handle can overcome the elastic force of the handle return spring, allowing the lower end of the handle to be inserted into the handle insertion hole, thereby realizing the snap-fit ​​linkage between the handle and the handle drive shaft.

[0008] Preferably, the handle drive sleeve is equipped with a handle positioner for defining the handle reset position, and the top of the handle drive sleeve is covered with a handle cover for encapsulating the handle reset spring.

[0009] Preferably, when the handle is not pressed down, turning the handle can only cause the handle drive sleeve to rotate freely, but cannot drive the handle drive shaft to rotate, thus achieving the function of preventing accidental touch.

[0010] Preferably, the middle end of the handle drive shaft is provided with a reversing valve core lever insertion hole. One end of the reversing valve core lever is inserted into the insertion hole and fixedly connected to the handle drive shaft, and the other end abuts and moves in linkage with the reversing valve core.

[0011] Beneficial effects This utility model provides a manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle. Compared with the prior art, it has the following advantages: (1) The manual-automatic hydraulic relief valve with anti-accidental touch handle, when not in operation, the handle is separated from the handle drive shaft under the action of the return spring. At this time, turning the handle can only drive the drive sleeve to rotate freely and cannot drive the valve core to move. This effectively avoids the hydraulic system from being accidentally reversed due to accidental touch or rotation of the handle, and prevents equipment damage or safety hazards caused by operational errors. The handle needs to be pressed down before it can be engaged with the drive shaft, forming a dual operation logic of "pressing down-rotating". This clarifies the operation triggering conditions, reduces the probability of unexpected operation, and provides safety protection for operators and equipment.

[0012] (2) The manual-automatic hydraulic relief valve with anti-accidental touch handle is simple and convenient to operate manually. Simply press down and turn the handle to achieve the reversal. No complicated tools or professional skills are required. Operators can quickly master it and improve the efficiency of emergency handling. After the operation is completed, the handle and valve core can be automatically reset under the action of the reset spring. No additional manual adjustment is required, which simplifies the operation process and reduces human operation error.

[0013] In summary, this application addresses the shortcomings of existing electromagnetic relief valves that rely solely on electromagnetic coil control. When power outages or electromagnetic coil failures occur, the two-position two-way directional valve can be manually switched, ensuring that the hydraulic pump can start under zero pressure and zero load. This avoids problems such as the hydraulic pump failing to start or the motor tripping due to overload, thus ensuring production continuity. Furthermore, the combination of manual switching and electromagnetic control provides dual protection, enabling the hydraulic system to adapt to complex factory conditions, reducing the risk of downtime due to the failure of a single control method, and significantly improving the operational stability and fault resistance of the hydraulic system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the manual reversing device for preventing accidental touches according to this utility model.

[0015] In the diagram: 1-Main valve, 2-Pilot pressure regulating valve, 3-Two-position two-way directional valve, 4-Directional valve return spring, 5-Handle drive shaft, 6-Handle drive sleeve, 7-Handle return spring, 8-Handle, 9-Handle cover, 10-Handle positioner, 11-Directional valve spool lever, 12-Solenoid coil, 13-Directional valve spool, 14-Manual device housing, 15-Relief valve pressure regulating screw. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-2 This utility model provides a technical solution: a manual-automatic hydraulic relief valve with an anti-accidental touch handle, including a main valve 1, a pilot pressure regulating valve 2, a two-position two-way directional valve 3, a directional valve return spring 4, an electromagnetic coil 12, and a relief valve pressure regulating screw 15, and also includes an anti-accidental touch manual directional device disposed between the two-position two-way directional valve 3 and the electromagnetic coil 12; wherein, the anti-accidental touch manual directional device is used to realize the manual directional switching of the two-position two-way directional valve 3, and has an anti-accidental touch function in the non-operation state, and can ensure the hydraulic pump starts with zero pressure and zero load when the electromagnetic coil 12 fails to power.

[0018] Regarding the design scheme of the anti-accidental touch manual reversing device: The anti-accidental touch manual reversing device includes a manual device housing 14, a handle drive shaft 5 rotatably mounted on the manual device housing 14, and a reversing valve core lever 11 that is linked with the handle drive shaft 5 and used to move the reversing valve core 13 of the two-position two-way reversing valve 3. The reversing valve core 13 is extended to adapt to the connection with the reversing valve core lever 11.

[0019] As a further technical solution, the anti-accidental touch manual reversing device also includes a handle drive sleeve 6 fitted outside the handle drive shaft 5, a handle 8 movably inserted inside the handle drive sleeve 6, and a handle return spring 7 fitted inside the handle drive sleeve 6 and applying an elastic return force to the handle 8; in the non-operational state, the handle 8 remains separated from the handle drive shaft 5 under the action of the handle return spring 7; when the handle 8 is not pressed down, rotating the handle 8 can only drive the handle drive sleeve 6 to rotate freely, and cannot drive the handle drive shaft 5 to rotate, thus realizing the anti-accidental touch function.

[0020] As a further technical solution, the handle drive shaft 5 has a handle insertion hole at one end corresponding to the handle 8. Pressing down the handle 8 can overcome the elastic force of the handle return spring 7, so that the lower end of the handle 8 can be inserted into the handle insertion hole, thereby realizing the snap-fit ​​linkage between the handle 8 and the handle drive shaft 5.

[0021] As a further technical solution, the handle drive sleeve 6 is equipped with a handle positioner 10 for limiting the reset position of the handle 8, and the top of the handle drive sleeve 6 is covered with a handle cover 9 for encapsulating the handle reset spring 7.

[0022] As a further technical solution, a reversing valve core lever insertion hole is provided at the middle end of the handle drive shaft 5. One end of the reversing valve core lever 11 is inserted into the insertion hole and fixedly connected to the handle drive shaft 5, and the other end is in contact with the reversing valve core 13.

[0023] When the electromagnetic reversing valve coil fails and loses power, the operator can press down the handle 8 to overcome the force of the handle return spring 7, so that the lower end of the handle 8 is inserted into the hole of the handle drive shaft 5. The handle 8, the handle drive shaft 5, and the handle drive sleeve 6 rotate together. The handle drive shaft 5 drives the reversing valve core lever 11 to move the reversing valve core 13, realizing the reversing of the two-position two-way reversing valve 3, so that the hydraulic pump oil overflows directly from the main valve overflow port, realizing the zero-pressure and zero-load start of the hydraulic pump. After the hydraulic pump starts, release handle 8. Using the force of the reversing valve return spring 4, the reversing valve core 13 moves to the right, driving the reversing valve core lever 11 to rotate the handle drive shaft 5. At the same time, the handle return spring 7 lifts handle 8 upward, separating the lower end of handle 8 from the handle drive shaft 5. Handle 8 returns to its original position under the action of the handle positioner 10 inside the handle drive sleeve 6. When handle 8 is not pressed down, rotating handle 8 will only drive the handle drive sleeve 6 to rotate, but will not cause the handle drive shaft 5 to rotate, thus preventing accidental operation.

[0024] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle, comprising a main valve (1), a pilot pressure regulating valve (2), a two-position two-way directional valve (3), a directional valve reset spring (4), an electromagnetic coil (12), and a relief valve pressure regulating screw (15), characterized in that, It also includes a manual reversing device to prevent accidental contact, which is installed between the two-position two-way reversing valve (3) and the solenoid coil (12); The manual reversing device for preventing accidental contact is used to realize the manual reversing of the two-position two-way reversing valve (3), and has the function of preventing accidental contact in the non-operation state. It can ensure the hydraulic pump starts with zero pressure and zero load when the electromagnetic coil (12) fails to power.

2. The manual / automatic integrated hydraulic relief valve with anti-accidental touch handle according to claim 1, characterized in that: The anti-accidental touch manual reversing device includes a manual device housing (14), a handle drive shaft (5) rotatably mounted on the manual device housing (14), and a reversing valve core lever (11) linked with the handle drive shaft (5) for actuating the reversing valve core (13) of the two-position two-way reversing valve (3). The reversing valve core (13) is extended to adapt to the connection with the reversing valve core lever (11).

3. A manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle according to claim 2, characterized in that: The anti-accidental touch manual reversing device also includes a handle drive sleeve (6) fitted outside the handle drive shaft (5), a handle (8) movably inserted inside the handle drive sleeve (6), and a handle return spring (7) fitted inside the handle drive sleeve (6) and applying an elastic return force to the handle (8). In the non-operational state, the handle (8) remains separated from the handle drive shaft (5) under the action of the handle return spring (7).

4. A manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle according to claim 3, characterized in that: The handle drive shaft (5) has a handle insertion hole at one end corresponding to the handle (8). Pressing down the handle (8) can overcome the elastic force of the handle return spring (7) and allow the lower end of the handle (8) to be inserted into the handle insertion hole, thereby realizing the snap-fit ​​linkage between the handle (8) and the handle drive shaft (5).

5. A manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle according to claim 4, characterized in that: The handle drive sleeve (6) is equipped with a handle positioner (10) for limiting the reset position of the handle (8), and the top of the handle drive sleeve (6) is covered with a handle cover (9) for encapsulating the handle reset spring (7).

6. A manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle according to claim 5, characterized in that: When the handle (8) is not pressed down, turning the handle (8) can only drive the handle drive sleeve (6) to rotate freely, and cannot drive the handle drive shaft (5) to rotate, thus realizing the anti-accidental touch function.

7. A manual / automatic integrated hydraulic relief valve with an anti-accidental touch handle according to claim 6, characterized in that: The middle end of the handle drive shaft (5) is provided with a reversing valve core lever insertion hole. One end of the reversing valve core lever (11) is inserted into the insertion hole and fixedly connected to the handle drive shaft (5), and the other end is in contact with the reversing valve core (13) for linkage.

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