Worm and gear fine adjustment mechanism for adjusting starting current of proportional electromagnet

Abstract

The invention relates to a worm and gear fine adjustment mechanism for adjusting starting current of a proportional electromagnet. The worm and gear fine adjustment mechanism comprises a valve element, a worm gear spring seat, a spring, a worm and a spring seat. The two valves are mounted in a valve cavity of the valve body; wherein the worm gear spring seat is matched with a valve element cavity of the valve body in a spiral pair mode, meanwhile, the worm gear spring seat is meshed with the worm, the valve element, the spring and the spring seat are sequentially arranged in the worm gear spring seat in a sleeved mode, the worm gear spring seat is driven by the worm to move in the valve body in a spiral mode, and the pre-compression amount of the spring is changed. Therefore, the starting current of the proportion electromagnet arranged at the outer end of the spring seat is changed. The worm gear spring seat with external threads is arranged to be in threaded fit with the inner wall of the valve cavity, adjustment is conducted through the worm, the axial position of the worm gear spring seat can be adjusted, then the pre-compression force of the spring can be continuously adjusted, the magnitude of starting current is adjusted, and the requirements of different working conditions of a main machine are met; the worm and gear structure is small in occupied space, high in stability and capable of meeting the requirement for continuous adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-way valve control, and particularly relates to a worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid. Background Art

[0002] In an electro-hydraulic proportional load-sensing multi-way valve, the output force of a proportional solenoid is proportional to the input current. Therefore, the proportional solenoid converts this input current into a force acting on the spool to overcome the elastic force of a spring and drive the spool to move, thereby changing the opening area of the valve port and further changing the flow rate through the valve port. In this way, a proportional relationship is established between the input current and the flow rate through the valve port.

[0003] When the input current reaches a certain value, it can just overcome the pre-compression force of the spring, and the spool just begins to move. At this time, a small flow rate of about 1 L / min has passed through the valve port. The input current at this time is called the opening current. The opening current is an important performance parameter of the electro-hydraulic proportional valve, and the size of the opening current can be adjusted by adjusting the pre-compression force of the spring.

[0004] In the prior art, the common methods for adjusting the pre-compression force of the spring are mostly to disassemble and assemble the multi-way valve, replace springs with different parameters, or add a spacer structure inside the valve cavity to adjust the pre-compression force of the spring. This method is not only troublesome to disassemble and assemble, but also the pre-compression force of the spring can only change in a stepped manner and cannot be continuously adjusted, which cannot meet the production requirements. Now, a worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid is proposed, which can continuously adjust the pre-compression force of the spring to adjust the size of the opening current to meet the different working conditions requirements of the main engine. Summary of the Invention

[0005] The purpose of the present invention is to provide a worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid, aiming to overcome the defects of the prior art and solve the problems of troublesome disassembly and assembly, inability to continuously adjust the pre-compression force of the spring, and inability to meet the production requirements.

[0006] For this reason, the present invention proposes a worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid, including: A valve body, which has a valve cavity inside; A spool, installed in the valve cavity; A worm gear spring seat, which is a special-shaped worm gear structure, with worm gear teeth and external thread one on the outside, and the worm gear spring seat is in a spiral pair with the valve cavity of the valve body; A spring, sleeved on the spool; A spring seat, in contact with the spring and installed inside the worm gear spring seat, and fixedly connected to the spool at the same time; A worm, meshing with the worm gear teeth of the worm gear spring seat, and a proportional solenoid, arranged at the outer end of the spring seat; The worm drives the worm gear spring seat to move spirally in the valve body, changing the pre-compression amount of the spring, and further changing the starting current magnitude of the proportional solenoid.

[0007] As a preferred technical solution of the present application, the interior of the worm gear spring seat is a stepped hole structure, provided with a stepped boring hole for placing the spring.

[0008] As a preferred technical solution of the present application, a first guiding hole matching the valve core is provided at the central position inside the worm gear spring seat.

[0009] As a preferred technical solution of the present application, a second guiding hole matching the spring seat is provided at the central position inside the worm gear spring seat.

[0010] As a preferred technical solution of the present application, the spring is sleeved on the valve core, and both ends of the spring are respectively in contact with the spring seat and the worm gear spring seat.

[0011] As a preferred technical solution of the present application, an external thread two is provided at the end of the valve core, a threaded hole is provided at one end of the spring seat, and the valve core is threadedly connected to the threaded hole of the spring seat through the external thread two.

[0012] As a preferred technical solution of the present application, the number of heads of the worm is 1, and the number of teeth of the worm gear of the worm gear spring seat is 40.

[0013] As a preferred technical solution of the present application, the pitch of the external thread one in the worm gear spring seat is 1 mm.

[0014] As a preferred technical solution of the present application, the spring stiffness is 10 N / mm.

[0015] As a preferred technical solution of the present application, when the proportional solenoid is not energized, the valve core closes the valve port under the action of the spring pre-compression force; when the proportional solenoid is energized, the proportional solenoid overcomes the spring force, causing the valve core to move and the valve port to open.

[0016] A worm and worm gear fine adjustment mechanism for adjusting the opening current of a proportional solenoid provided by the present invention, by providing a worm gear spring seat with an external thread to be threadedly matched with the inner wall of the valve cavity, and adjusting through a worm, the axial position of the worm gear spring seat can be adjusted, and further the spring pre-compression force can be continuously adjusted to adjust the magnitude of the opening current to meet the different working conditions requirements of the host; the worm and worm gear structure occupies a small space and has high stability, and can meet the requirements of continuous adjustment.

[0017] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The following will refer to the drawings to make a further detailed description of the present application. Brief Description of the Drawings

[0018] The accompanying drawings of the specification, which form a part of this application, are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings: Figure 1 It is a schematic structural diagram of a worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid valve according to the present invention; Figure 2 It is a sectional view of a worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid valve according to the present invention; Figure 3 It is a developed view of a partial structure in a worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid valve according to the present invention; Explanation of reference numerals: 1, valve body; 2, valve core; 3, worm gear spring seat; 4, spring; 5, worm; 6, spring seat; 7, proportional solenoid valve; 21, external thread two; 31, worm gear teeth; 32, external thread one; 33, stepped boring; 34, guiding hole one; 35, guiding hole two; 61, threaded hole. Detailed implementation manners

[0019] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will refer to the drawings and combine with the embodiments to detail this application.

[0020] As Figures 1 to 3 shown, a worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid valve according to the present invention includes a valve core 2, a worm gear spring seat 3, a spring 4, a worm 5 and a spring seat 6; all are installed in the valve cavity of the valve body 1; wherein, the worm gear spring seat 3 is in a helical pair with the valve core cavity of the valve body 1, and at the same time, the worm gear spring seat 3 meshes with the worm 5, and the valve core 2, the spring 4 and the spring seat 6 are sequentially sleeved inside the worm gear spring seat 3. The worm 5 drives the worm gear spring seat 3 to rotate spirally in the valve body 1 and realizes axial movement through the thread pair with the valve body, so as to change the pre-compression amount of the spring 4, and further change the starting current magnitude of the proportional solenoid valve 7 arranged at the outer end of the spring seat 6.

[0021] Specifically, the worm gear spring seat 3 is a special-shaped worm gear. The inside of the worm gear spring seat 3 is a stepped hole structure for installing the valve core 2, the spring 4 and the spring seat 6, and the outside is a worm gear structure, which is matched with the worm 5 and the valve cavity of the valve body 1.

[0022] Among them, an external thread 32 is also provided on the outer cylindrical surface of the worm wheel spring seat 3, and the external thread 32 is in threaded fit with the inner side wall of the valve cavity of the valve body 1; at the same time, a plurality of worm wheel teeth 31 arranged in a ring are also provided on the outer cylindrical surface of the worm wheel spring seat 3, which are engaged with the outer worm 5. By driving the worm wheel spring seat 3 to rotate circumferentially through the worm 5, the worm wheel spring seat 3 is further driven to move spirally in the valve cavity of the valve body 1, so as to change the initial position of the worm wheel spring seat 3 in the valve body.

[0023] In addition, the central position inside the worm wheel spring seat 3 is a stepped hole structure, specifically provided with a first guiding hole 34 matching the valve core 2, a stepped boring hole 33 for placing the spring 4, and a second guiding hole 35 matching the spring seat 6.

[0024] Among them, an external thread 21 is provided at the end of the valve core 2, a threaded hole 61 is provided at one end of the spring seat 6, and the valve core 2 is in threaded connection with the spring seat 6 to form a detachable fixation. The spring 4 is sleeved on the valve core 2, and both ends of the spring 4 are respectively abutted against the spring seat 6 and the worm wheel spring seat 3; thus, it is convenient to install and disassemble the valve core 2, the spring 4 and the spring seat 6.

[0025] When the proportional electromagnet 7 is not energized, the valve core 2 closes the valve port under the action of the pre-compression force of the spring 4; when the proportional electromagnet is energized, the proportional electromagnet 7 overcomes the elastic force of the spring 4, causing the valve core 2 to move leftward, the valve port opens, and fluid flows through the valve port into the actuator for work, and the greater the current, the larger the opening area of the valve port and the greater the flow rate through it.

[0026] Rotate the worm 5. Through the meshing movement of the worm and worm wheel, adjust the axial initial position of the worm wheel spring seat 3 relative to the valve cavity, and then change the pre-compression amount of the spring, so as to change the starting current magnitude of the proportional electromagnet 7.

[0027] In an embodiment, the number of heads of the worm 5 is 1, the number of worm wheel teeth of the worm wheel spring seat 3 is 40, the pitch of the external thread 32 in the worm wheel spring seat 3 is 1 mm, and the stiffness of the spring 4 is 10 N / mm; when the worm 5 rotates one circle, the worm wheel spring seat 3 axially moves 0.025 mm, the pre-compression amount of the spring changes 0.025 mm, that is, the spring force changes 0.25 N, so that continuous adjustment of the opening current can be achieved.

[0028] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A worm and worm gear fine adjustment mechanism for adjusting the opening current of a proportional solenoid, characterized in that, Comprising: A valve body (1) with a valve cavity provided inside thereof; A valve core (2) installed in the valve cavity; A worm gear spring seat (3), which is a special-shaped worm gear structure, with worm gear teeth (31) and a first external thread (32) provided on the outside, and the worm gear spring seat (3) is in screw pair cooperation with the valve cavity of the valve body (1); A spring (4) sleeved on the valve core (2); A spring seat (6) that abuts against the spring (4) and is installed inside the worm gear spring seat (3), and is fixedly connected to the valve core (2) by threads at the same time; A worm (5) that meshes with the worm gear teeth (31) of the worm gear spring seat (3); And a proportional electromagnet (7) provided at the outer end of the spring seat (6); The worm (5) drives the worm gear spring seat (3) to move spirally inside the valve body (1), changing the pre-compression amount of the spring (4), and further changing the starting current magnitude of the proportional electromagnet (7).

2. The worm and worm gear fine adjustment mechanism for adjusting the opening current of the proportional solenoid according to claim 1, characterized in that, The inside of the worm gear spring seat (3) is a stepped hole structure, with a stepped boring hole (33) for placing the spring (4).

3. A worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid according to claim 2, characterized in that, A first guiding hole (34) matching the valve core (2) is provided at the central position inside the worm gear spring seat (3).

4. A worm and worm gear fine adjustment mechanism for adjusting the opening current of a proportional solenoid according to claim 2, characterized in that, A second guiding hole (35) matching the spring seat (6) is provided at the central position inside the worm gear spring seat (3).

5. A worm and worm gear fine adjustment mechanism for adjusting the opening current of a proportional solenoid according to claim 1, characterized in that, The spring (4) is sleeved on the valve core (2), and both ends of the spring (4) abut against the spring seat (6) and the worm gear spring seat (3) respectively.

6. A worm and worm gear fine adjustment mechanism for adjusting the opening current of a proportional solenoid, characterized in that, An external second thread (21) is provided at the end of the valve core (2), and a threaded hole (61) is provided at one end of the spring seat (6), and the valve core (2) is threadedly connected to the threaded hole (61) of the spring seat (6) through the external second thread (21).

7. A worm and worm gear fine-tuning mechanism for adjusting the opening current of a proportional solenoid, characterized in that, The number of starts of the worm (5) is 1, and the number of worm gear teeth of the worm gear spring seat (3) is 40.

8. A worm and worm gear fine adjustment mechanism for adjusting the opening current of a proportional solenoid according to claim 1, characterized in that, The pitch of the first external thread (32) in the worm gear spring seat (3) is 1 mm.

9. A worm and worm gear fine adjustment mechanism for adjusting the opening current of a proportional solenoid according to claim 1, characterized in that, The stiffness of the spring (4) is 10 N / mm.

10. A worm and worm gear fine adjustment mechanism for adjusting the opening current of a proportional solenoid according to claim 1, characterized in that, When the proportional electromagnet (7) is not energized, the valve core (2) closes the valve port under the action of the pre-compression force of the spring (4); when the proportional electromagnet (7) is energized, the proportional electromagnet (7) overcomes the elastic force of the spring (4), causing the valve core (2) to move and the valve port to open.

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