Mining intrinsically safe electromagnetic pilot valve based on pulse control electromagnet

Abstract

The utility model discloses a mining intrinsically safe electromagnetic pilot valve based on a pulse control electromagnet. The mining intrinsically safe electromagnetic pilot valve comprises an electromagnet assembly and a pilot valve assembly fixedly connected with the electromagnet assembly. A coil driving circuit and a flexible circuit board are arranged on one side in the shell, and the flexible circuit board is connected with the coil assembly; one end of the flexible circuit board is connected with the coil driving circuit, and the other end is provided with an elastic sheet and is contacted with the electromagnet assembly through the elastic sheet; an input terminal of the coil driving circuit is respectively connected with the comparator, the MOS tube circuit, the elastic sheet and the power-on indicating lamp, the elastic sheet is connected with the position indicating lamp, the MOS tube circuit is respectively connected with the PWM circuit and the coil, and the coil is connected with the protection circuit; and the comparator is respectively connected with the delay circuit and the PWM circuit. According to the mining intrinsically safe electromagnetic pilot operated valve, PWM is used for pulse driving of the electromagnet structure, the starting current and the holding current of the mining intrinsically safe electromagnetic pilot operated valve in the prior art can be reduced, and therefore the power consumption of the whole system is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic valves, in particular to a pulse-controlled electromagnet-based intrinsically safe electromagnetic pilot valve for mining. Background Art

[0002] With the rapid development of the coal mining industry, the research on electro-hydraulic control has been continuously deepened, and the successful development of the electromagnetic pilot valve has provided a reliable guarantee for the realization of the electro-hydraulic control system. The electromagnetic pilot valve is widely used in the coal mining industry.

[0003] At present, the main structural forms of electromagnetic pilot valves in the industry are that the electromagnet directly drives the hydraulic part and the electromagnet indirectly drives the hydraulic part through a lever structure. Both structures have the problem of large starting current or large maintaining current of the electromagnet, which leads to high power consumption of the entire electromagnetic pilot valve.

[0004] In addition, the existing electromagnetic pilot valve coils all require manual threading, which has low assembly efficiency; the working indicator light can only display the power-on status of the electromagnet, and cannot reflect the hydraulic control working status. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a pulse-controlled electromagnet structure that uses PWM to pulse-drive an intrinsically safe electromagnetic pilot valve for mining, which can reduce the starting current and maintaining current of the intrinsically safe electromagnetic pilot valve for mining in the prior art, thereby reducing the power consumption of the entire system.

[0006] The purpose of the utility model is achieved through the following technical solutions: an intrinsically safe electromagnetic pilot valve for mining based on a pulse-controlled electromagnet, comprising an electromagnet assembly and a pilot valve assembly fixedly connected to the electromagnet assembly;

[0007] The electromagnet assembly comprises a shell, two sets of symmetrically arranged electromagnet structures are arranged inside the shell, and two sets of symmetrically arranged upper covers, sealing rubber caps and baffles are arranged outside the shell;

[0008] Each set of electromagnet structures includes a yoke, an armature, a coil assembly, a coil housing, a push rod, and a spring;

[0009] A yoke is provided at the lower end of the coil housing, an armature is provided above the yoke, a push rod is fixed at the center of the armature, a ring-shaped coil assembly is provided in the coil housing, the armature and the yoke are located in the middle of the coil assembly, and the push rod is slidably penetrated in the center of the yoke and the armature; the lower end of the push rod passes through the yoke and is transmission-connected to the pilot valve assembly, a baffle is fixed at the upper end of the push rod, and an upper cover and a sealing rubber cap are provided on the top of the baffle; the top of the coil assembly is provided with two spring contacts, which pass through the upper end of the coil housing; the upper half of the yoke is provided with a spring sleeved on the outer periphery of the push rod;

[0010] A coil drive circuit and a flexible circuit board are provided on one side of the housing, one end of the flexible circuit board is connected to the coil drive circuit, and the other end is connected to the spring contact of the coil assembly; at the same time, a spring sheet is provided on the flexible circuit board, which contacts the baffle sheet through the spring sheet;

[0011] The coil drive circuit includes three indicator lights, an input terminal, a comparator, a delay circuit, a PWM circuit, a MOS tube circuit and a protection circuit. The three indicator lights are power-on indicator lights of the two electromagnet structures and a position indicator light of the electromagnet working; the input terminal is respectively connected to the comparator, the MOS tube circuit, the spring and the power-on indicator light, the spring and the position indicator light are connected, the MOS tube circuit is respectively connected to the PWM circuit and the coil assembly, and the coil assembly is also connected to the protection circuit through a flexible circuit board; the comparator is respectively connected to the delay circuit and the PWM circuit.

[0012] The pilot valve assembly includes a valve body, a damper, and two symmetrically arranged groups of levers and valve core assemblies. The lever is fixed to the upper end of the valve body, the valve core assembly is installed inside the valve body, the damper is fixed in the liquid hole on the side of the valve body, and the valve core assembly corresponds to the electromagnet push rod structure one by one through the lever.

[0013] The beneficial effects of the utility model are as follows: using PWM to pulse-drive the electromagnet structure can reduce the starting current and the maintaining current of the intrinsically safe electromagnetic pilot valve for mining in the prior art, thereby reducing the power consumption of the entire system; designing the electromagnet structure as a separate component and using contact connection can simplify the assembly process; adding a structure and an indicator light for detecting the working position of the electromagnet structure facilitates more direct judgment of the working status and faults of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an overall cross-sectional view of an intrinsically safe electromagnetic pilot valve for mining provided by the utility model;

[0015] Figure 2 This is a cross-sectional view of the electromagnet structure provided by the utility model;

[0016] Figure 3 It is a top view of the electromagnet structure provided by the utility model;

[0017] Figure 4 This is a front view of the flexible circuit board provided by the utility model;

[0018] Figure 5 This is a top view of the intrinsically safe electromagnetic pilot valve for mining provided by the utility model;

[0019] Figure 6 This is a principle block diagram of the coil drive circuit provided by the utility model;

[0020] Explanation of the reference numerals: 1-electromagnet assembly; 101-flexible circuit board; 102-coil drive circuit; 103-electromagnet structure; 104-housing; 105-upper cover; 106-sealing rubber cap; 107-blocking piece; 1021-power-on indicator light; 1022-position indicator light; 1031-yoke; 1032-armature; 1033-coil assembly; 1034-coil housing; 1035-top rod; 1036-spring contact; 1037-spring; 2-pilot valve assembly; 201-valve body; 202-lever; 203-damper; 204-valve core assembly. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further explained below in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, a pulse-controlled electromagnet-based intrinsically safe electromagnetic pilot valve for mining of the utility model comprises an electromagnet assembly 1 and a pilot valve assembly 2 fixedly connected to the electromagnet assembly 1;

[0023] The electromagnet assembly 1 comprises a housing 104, wherein two sets of symmetrically arranged electromagnet structures 103 are arranged inside the housing 104, and two sets of symmetrically arranged upper covers 105, sealing rubber caps 106 and baffles 107 are arranged outside the housing 104;

[0024] Each set of electromagnet structures 103 includes a yoke 1031, an armature 1032, a coil assembly 1033, a coil housing 1034, a push rod 1035, and a spring 1037. Figure 2 As shown;

[0025] A yoke 1031 is provided at the lower end of the coil housing 1034, an armature 1032 is provided above the yoke 1031, a push rod 1035 is fixedly provided at the center of the armature 1032, an annular coil assembly 1033 is provided in the coil housing 1034, the armature 1032 and the yoke 1031 are located in the middle of the coil assembly 1033, and the push rod 1035 is slidably penetrated in the center of the yoke 1031 and the armature 1032; the lower end of the push rod 1035 passes through the yoke 1031 and is transmission-connected to the pilot valve assembly 2, a baffle 107 is fixed to the upper end of the push rod 1035, and an upper cover 105 and a sealing rubber cap 106 are provided on the top of the baffle 107; the top of the coil assembly 1033 is provided with two spring contacts 1036, and the spring contacts 1036 pass through the upper end of the coil housing 1034, such as Figure 3 As shown; the upper part of the yoke 1031 is provided with a spring 1037 sleeved on the outer periphery of the top rod 1035;

[0026] The housing 104 has a coil drive circuit 102 and a flexible circuit board 101 on one side. One end of the flexible circuit board 101 is connected to the coil drive circuit 102, and the other end is connected to the spring contact 1036 of the coil assembly. At the same time, a spring sheet is also provided on the flexible circuit board, which contacts the baffle 107 through the spring sheet. Figure 4 As shown; the coil drive circuit 102 includes three indicator lights, an input terminal, a comparator, a delay circuit, a PWM circuit, a MOS tube circuit and a protection circuit. The three indicator lights are power-on indicator lights 1021 and 1022 of the two electromagnet structures and an electromagnet working position indicator light 1022, as shown Figure 5 As shown, the input terminal is respectively connected to the comparator, the MOS tube circuit, the spring and the power-on indicator light, the spring is connected to the position indicator light, the MOS tube circuit is respectively connected to the PWM circuit and the coil assembly, and the coil assembly is also connected to the protection circuit through the flexible circuit board; the comparator is respectively connected to the delay circuit and the PWM circuit, as shown Figure 6 shown.

[0027] The pilot valve assembly 2 includes a valve body 201, a damper 203, and two symmetrically arranged groups of levers 202 and a valve core assembly 204. The lever 202 is fixed to the upper end of the valve body 201, the valve core assembly 204 is installed inside the valve body 201, and the damper 203 is fixed in the side liquid hole of the valve body 201. The valve core assembly corresponds to the electromagnet push rod 1035 structure through the lever 202. The pilot valve assembly belongs to the prior art, and its working principle and specific more detailed structure are not repeated here.

[0028] The working principle of the coil drive circuit is as follows: when the input terminal is powered on, the power-on indicator light corresponding to the electromagnet structure works, the comparator is powered on and works, the delay circuit starts timing, the PWM circuit does not work, and the MOS tube circuit works and directly supplies power to the coil; when the delay circuit reaches the set time, the comparator outputs a signal to start the PWM circuit, and the MOS tube circuit starts to pulse power on the coil after receiving the PWM signal. The coil drive circuit 102 is electrically connected to the two spring contacts 1036 at the top of the coil assembly 1033 through the flexible circuit board 101, thereby transmitting power. After power is turned on, the coil assembly 1033 generates a magnetic field, and the coil housing 1034, the yoke 1031 and the armature 1032 are magnetized to generate electromagnetic attraction; the yoke 1031 and the armature 1032 attract each other, and the armature 1032 moves toward the yoke 1031 and contacts the yoke 1031, and drives the top rod 1035 fixed at the center of the armature 1032 to move; the baffle 107 at the upper end of the top rod 1035 also moves synchronously and presses the spring above the flexible circuit board 101, and the position indicator light 1022 is powered on after the spring contacts. The protection circuit is in the coil drive circuit 102 and is electrically connected to the coil assembly through the flexible circuit board 101.

[0029] The working principle of the position indicator light is as follows: when the electromagnet structure works normally, the armature moves downward and engages with the yoke, the armature drives the push rod to move downward, the push rod drives the baffle to move downward, the baffle presses the spring above the flexible circuit board, and the position indicator light is energized and works after the spring contacts.

[0030] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical inspirations disclosed in the present invention without departing from the essence of the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A mining intrinsically safe electromagnetic pilot valve based on pulse control electromagnet, characterized in that: It comprises an electromagnet assembly (1) and a pilot valve assembly (2) fixedly connected to the electromagnet assembly (1); The electromagnet assembly (1) comprises a housing (104), wherein two groups of symmetrically arranged electromagnet structures (103) are arranged inside the housing (104), and two groups of symmetrically arranged upper covers (105), sealing rubber caps (106) and baffles (107) are arranged outside the housing (104); Each set of electromagnet structures (103) includes a yoke (1031), an armature (1032), a coil assembly (1033), a coil housing (1034), a push rod (1035), and a spring (1037); A yoke (1031) is provided at the lower end of the coil housing (1034), an armature (1032) is provided above the yoke (1031), a push rod (1035) is fixedly provided at the center of the armature (1032), an annular coil assembly (1033) is provided in the coil housing (1034), the armature (1032) and the yoke (1031) are located in the middle of the coil assembly (1033), and the push rod (1035) is slidably provided in the center of the yoke (1031) and the armature (1032); The end of the push rod (1035) passes through the yoke (1031) and is connected to the pilot valve assembly (2); a baffle (107) is fixed to the upper end of the push rod (1035); a top cover (105) and a sealing rubber cap (106) are provided on the top of the baffle (107); the top of the coil assembly (1033) is provided with two spring contacts (1036), and the spring contacts (1036) pass through the upper end of the coil housing (1034); the upper half of the yoke (1031) is provided with a spring (1037) sleeved on the outer periphery of the push rod (1035); A coil drive circuit (102) and a flexible circuit board (101) are provided on one side of the housing (104); one end of the flexible circuit board (101) is connected to the coil drive circuit (102), and the other end is connected to a spring contact (1036) of the coil assembly; and a spring sheet is provided on the flexible circuit board, which contacts the baffle (107) through the spring sheet; The coil drive circuit (102) comprises three indicator lights, an input terminal, a comparator, a delay circuit, a PWM circuit, a MOS tube circuit and a protection circuit. The three indicator lights are respectively power-on indicator lights of two electromagnet structures and a position indicator light of the electromagnet working; the input terminal is respectively connected to the comparator, the MOS tube circuit, the spring and the power-on indicator lights, the spring is connected to the position indicator light, the MOS tube circuit is respectively connected to the PWM circuit and the coil assembly, and the coil assembly is also connected to the protection circuit via a flexible circuit board; the comparator is respectively connected to the delay circuit and the PWM circuit.

2. According to claim 1, a pulse-controlled electromagnet-based intrinsically safe electromagnetic pilot valve for mining, characterized in that: The pilot valve assembly (2) comprises a valve body (201), a damper (203), and two groups of levers (202) and valve core assemblies (204) that are symmetrically arranged. The lever (202) is fixed to the upper end of the valve body (201), the valve core assembly (204) is installed inside the valve body (201), and the damper (203) is fixed in a liquid hole on the side of the valve body (201). The valve core assemblies correspond to the electromagnet push rod (1035) structure one by one through the lever (202).

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