An electromagnetic valve integrated device for the electronic parking brake of a forklift

Abstract

An electromagnetic valve integrated device for an electronic parking brake of a forklift, comprising: a valve block, on which a two-position two-way electromagnetic directional valve, a two-position three-way electromagnetic directional valve, a safety overflow valve, a check valve and an accumulator are installed; a first oil circuit, the two-position two-way electromagnetic directional valve is connected to the first oil circuit to realize the liquid filling and protection of the accumulator; a second oil circuit, the two-position three-way electromagnetic directional valve is connected to the second oil circuit to realize the parking brake; a third oil circuit, the safety overflow valve is connected to the third oil circuit to realize the pressure limiting protection of the accumulator; a fourth oil circuit, the check valve is connected to the fourth oil circuit to realize the liquid filling and pressure maintaining of the accumulator. The present invention provides an electromagnetic valve integrated device for an electronic parking brake of a forklift, which can realize the liquid filling and protection of the accumulator, and effectively complete the effects of parking brake, pressure limiting protection and liquid filling and pressure maintaining, effectively improving the safety and efficiency of forklift parking.

Description

Technical Field

[0001] The present invention relates to the technical field of forklifts, and specifically to a solenoid valve integrated device for electronic parking brakes of forklifts. Background Art

[0002] With the continuous development of electronic parking brake technology, the electronic parking brake technology has been widely applied to forklifts, especially more widely applied to electric forklifts. Although the electronic parking brake technology is safe and reliable and can achieve automatic parking, it cannot be directly applied to existing forklifts. Therefore, it is necessary to design such a device suitable for use in forklifts. Summary of the Invention

[0003] The purpose of the present invention is to provide specifically a solenoid valve integrated device for electronic parking brakes of forklifts to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A solenoid valve integrated device for electronic parking brakes of forklifts, comprising: a valve block, on which a two-position two-way solenoid directional valve, a two-position three-way solenoid directional valve, a safety relief valve, and a check valve are installed; an accumulator, which is detachably installed on the valve block; wherein, inside the valve block there are: a first oil passage, which is formed inside the valve block, and the two-position two-way solenoid directional valve is connected to the first oil passage to achieve liquid filling and protection of the accumulator; a second oil passage, which is formed inside the valve block, and the two-position three-way solenoid directional valve is connected to the second oil passage to achieve parking brake; a third oil passage, which is formed inside the valve block, and the safety relief valve is connected to the third oil passage to achieve pressure limiting protection of the accumulator; a fourth oil passage, which is formed inside the valve block, and the check valve is connected to the fourth oil passage to achieve liquid filling and pressure maintaining of the accumulator.

[0005] It further includes a parking brake release pressure control switch, which is installed on the valve block and connected to the fourth oil passage.

[0006] The fourth oil passage includes an oil passage nine and an oil passage eleven. One port of the oil passage eleven is connected to the oil passage nine through a check valve, the other port of the oil passage eleven is an oil inlet, and the other port of the oil passage nine is connected to the accumulator.

[0007] It further includes an accumulator liquid filling pressure control switch and an accumulator stop liquid filling pressure control switch. The accumulator liquid filling pressure control switch and the accumulator stop liquid filling pressure control switch are both installed on the valve block, and the accumulator liquid filling pressure control switch and the accumulator stop liquid filling pressure control switch are both respectively connected to the fourth oil passage.

[0008] An internal oil passage one and a two-way stop valve are provided inside the two-position two-way solenoid directional valve.

[0009] An internal oil passage two and an internal oil passage three are provided inside the two-position three-way electromagnetic directional control valve, and the two-position three-way electromagnetic directional control valve realizes oil passage switching through the internal oil passage two and the internal oil passage three.

[0010] The first oil circuit includes an oil passage one, an oil passage two, an oil passage twelve, and an oil passage thirteen. Among them, the oil passage one is communicated with the oil passage two, the two-position two-way electromagnetic directional control valve communicates the oil passage one and the oil passage thirteen, one end of the oil passage twelve is an oil return port, and the other end is connected to the two-position three-way electromagnetic directional control valve.

[0011] The second oil circuit includes an oil passage three, an oil passage four, an oil passage six, and an oil passage twelve; among them, one port of the oil passage three is a parking brake oil port, and the other port is connected to the two-position three-way electromagnetic directional control valve; one port of the oil passage four is communicated with the oil passage three, and the other port is connected to the parking brake release pressure control switch; one port of the oil passage six is communicated with the fourth oil circuit, and the other port is connected to the two-position three-way electromagnetic directional control valve. The fourth oil circuit includes an oil passage nine and an oil passage twelve. The oil passage nine and the oil passage twelve are connected through a one-way valve. The oil passage nine is communicated with the accumulator. The port of the oil passage six is communicated with the oil passage nine of the fourth oil circuit; one end of the oil passage twelve is an oil return port, and the other end is connected to the two-position three-way electromagnetic directional control valve.

[0012] The third oil circuit includes an oil passage two, an oil passage ten, and an oil passage twelve; among them, one port of the oil passage two is communicated with the two-position three-way electromagnetic directional control valve, and the other port is communicated with the two-position two-way electromagnetic directional control valve; one port of the oil passage ten is communicated with the safety relief valve, and the other port is communicated with the oil passage eleven; one end of the oil passage twelve is an oil return port, and the other end is connected to the two-position three-way electromagnetic directional control valve.

[0013] The port of the oil passage nine is a filling oil port communicating with the accumulator port.

[0014] As can be seen from the above technical solutions, the present invention provides a solenoid valve integrated device for a forklift electronic parking brake, which can realize the filling and protection of the accumulator, and effectively complete the effects of parking brake, pressure limiting protection, and filling and pressure maintaining, effectively improving the safety and efficiency of forklift parking. Brief Description of the Drawings

[0015] Figure 1 It is the front view of the integrated valve block including the valve body cross-sectional view of the present invention;

[0016] Figure 2 It is the top view of the integrated valve block of the present invention;

[0017] Figure 3 In the present invention Figure 2 The B-B cross-sectional view;

[0018] Figure 4 In the present inventionFigure 1 A-A sectional view;

[0019] Figure 5 This is the schematic diagram of the integrated valve block of the present invention.

[0020] In the figure: A1 inlet port, B1 parking brake oil port, C1 filling oil port, D1 return oil port, 01 accumulator filling pressure control switch, 02 parking brake release pressure control switch, 03 accumulator stop filling pressure control switch, 1 two-position two-way electromagnetic reversing valve, 101 internal oil passage 1, 102 two-way stop valve, 2 oil passage 1, 3 oil passage 2, 4 oil passage 3, 5 oil passage 4, 6 two-position three-way electromagnetic reversing valve, 601 internal oil passage 2, 602 internal oil passage 3, 7 oil passage 6, 8 oil passage 7, 9 accumulator, 10 oil passage 8, 11 oil passage 9, 12 check valve, 13 oil passage 10, 14 safety relief valve, 15 oil passage 11, 16 oil passage 12, 17 valve body, 18 oil passage 13. Detailed implementation mode

[0021] To further understand the purpose, structure, characteristics and functions of the present invention, the following is a detailed description in conjunction with the embodiments.

[0022] The device includes a valve body 17, a two-position two-way electromagnetic reversing valve 1, a two-position three-way electromagnetic reversing valve 6, a safety relief valve 14, an accumulator filling pressure control switch 01, a parking brake release pressure control switch 03 and an accumulator stop filling pressure control switch 03 installed on the valve body 17. It also includes a check valve 12. The check valve 12 is installed inside the valve body 17 and is used to control the flow direction of the internal oil passage, specifically as follows:

[0023] There are four oil circuits inside the valve body 17, namely the first oil circuit, the second oil circuit, the third oil circuit and the fourth oil circuit. Each oil circuit includes multiple oil passages, and there is a common relationship between the oil passages of each oil circuit. Specifically:

[0024] The first oil circuit, the first oil circuit includes oil passage 1 2, oil passage 2 3, oil passage 12 16 and oil passage 13 18. Among them, oil passage 1 2 is connected to oil passage 2 3, the two-position two-way electromagnetic reversing valve 1 connects oil passage 1 2 and oil passage 13 18, and one end of oil passage 12 16 is the return oil port C1, and the other end is connected to the two-position three-way electromagnetic reversing valve 6 to realize automatic filling and protection of the accumulator 9.

[0025] Second oil circuit, the second oil circuit includes oil passage three 4, oil passage four 5, oil passage six 7 and oil passage twelve 16; one port of the oil passage three 4 is the parking brake oil port B1, and the other port is connected to the two-position three-way electromagnetic directional valve 6; one port of the oil passage four 5 is communicated with the oil passage three 4, and the other port is connected to the parking brake release pressure control switch 02; one port of the oil passage six 7 is communicated with the oil passage nine 11, and the other port is connected to the two-position three-way electromagnetic directional valve 6, and the oil passage nine 11 is communicated with the accumulator 9 for parking brake.

[0026] Third oil circuit, the third oil circuit includes oil passage two 3, oil passage ten 13 and oil passage twelve 16; one port of the oil passage two 3 is communicated with the two-position three-way electromagnetic directional valve 6, and the other port is communicated with the two-position two-way electromagnetic directional valve 1; one port of the oil passage ten 13 is communicated with the safety relief valve 14, and the other port is communicated with the oil passage eleven 11; one end of the oil passage twelve 16 is the oil return port D1, and the other end is connected to the two-position three-way electromagnetic directional valve 6 to realize the pressure limit protection of the accumulator 9.

[0027] Fourth oil circuit, the fourth oil circuit includes oil passage nine 11 and oil passage eleven 15, one port of the oil passage eleven 15 is communicated with the oil passage nine 11 through the one-way valve 12, the other port of the oil passage eleven 15 is the oil inlet A1, and the other port of the oil passage nine 11 is communicated with the accumulator 9 to realize the liquid filling and pressure maintaining of the accumulator 9.

[0028] The parking brake release pressure control switch 02 is installed on the valve block 17 and communicated with the fourth oil circuit. Specifically, it is communicated with the oil passage eleven 15 of the fourth oil circuit to realize the low-pressure alarm of the parking brake.

[0029] The accumulator liquid filling pressure control switch 01 and the parking brake release pressure control switch 03 are installed on the valve block 17 and communicated with the fourth oil circuit. Specifically, it is communicated with the oil passage eleven 15 of the fourth oil circuit to control the maximum pressure and the minimum pressure of the accumulator 9, and realize automatic liquid filling and protection.

[0030] An internal oil passage one 101 and a two-way stop valve 102 are also provided in the two-position two-way electromagnetic directional valve 1 to realize the switching of the oil circuit and the liquid filling and protection of the accumulator 9; the two-position two-way electromagnetic directional valve 1 is a threaded cartridge valve, having an S1 position and an S2 position. When it is in the S1 position, it is in the off potential, and when it is in the S2 position, it is in the on potential.

[0031] The two-position three-way electromagnetic reversing valve 6 is provided with an internal oil passage two 601 and an internal oil passage three 602, which can conduct oil unidirectionally to realize the switching of the oil circuit for automatic parking and the release of parking. The two-position three-way electromagnetic reversing valve 6 is a threaded cartridge valve with an S3 position and an S4 position. When it is in the S3 position, it is in a de-energized state, and when it is in the S4 position, it is in an energized state, which is convenient for realizing the automation control of parking brake and release.

[0032] When the energy storage tank filling pressure control switch 01 is lower than the set pressure value, the two-position two-way electromagnetic reversing valve 1 is controlled by the system (ECU can be used) to be in the S2 energized state. The oil fluid sequentially passes through the oil inlet A1, the oil passage eleven 15, the check valve 12, the oil passage nine 11 and the filling oil port C1 and enters the energy storage tank 9 to realize filling.

[0033] When the filling pressure reaches the pressure threshold set by the energy storage tank stop filling pressure control switch 03, the two-position two-way reversing valve 1 is controlled by the system (ECU can be used) to be in the S1 de-energized state. The oil fluid sequentially passes through the oil inlet A1, the oil passage thirteen 18, the internal oil passage one 101, the oil passage one 2, the oil passage two 3, the oil passage twelve 16 and the oil return port D1 and enters the fuel tank to realize unloading. The check valve 12 cuts off the oil passage nine 11 and the oil passage eleven 15, and the energy storage tank 9 realizes pressure holding.

[0034] When the forklift is moving and the accelerator pedal is depressed, the two-position three-way electromagnetic reversing valve 6 is controlled by the system (ECU can be used) to be in the S4 energized state. The oil fluid in the energy storage tank 9 sequentially passes through the oil passage nine 11, the oil passage six 7, the internal oil passage three 602 and the oil passage three 4 and enters the parking brake oil port B1 to realize the release of the parking brake.

[0035] When the forklift stops and the accelerator pedal is released, the two-position three-way electromagnetic reversing valve 6 is controlled by the system (ECU can be used) to be in the S3 de-energized state. The oil circuits of the oil passage six 7 and the oil passage three 4 are cut off. The oil fluid in the parking brake flows through the parking brake oil port B1, the oil passage three 4, the internal oil passage two 601 and the oil passage eleven 15 in sequence under the action of the spring force to realize the parking brake.

[0036] When a fault occurs and the energy storage pressure of the energy storage tank 9 is lower than the set threshold of the parking brake release pressure control switch 02 and cannot meet the pressure for releasing the parking brake, the forklift buzzer gives an alarm through system control (ECU can be used).

[0037] When the two-position two-way electromagnetic reversing valve 1 fails and the energy storage tank 9 is always in the filling state and the pressure exceeds the threshold set by the safety relief valve 14, the oil fluid flowing through the oil inlet A1 and the oil passage eleven 15 will flow through the safety relief valve 14, through the oil passage two 3 and the oil passage twelve 16, enter the oil return port D1 and flow back to the fuel tank to realize pressure limiting protection.

[0038] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An electromagnetic valve integration device for the electronic parking brake of a forklift, characterized in that It includes: A valve block, on which a two-position two-way electromagnetic directional control valve, a two-position three-way electromagnetic directional control valve, a safety relief valve and a check valve are installed; An accumulator, which is detachably installed on the valve block; Among them, inside the valve block there is: A first oil circuit, the two-position two-way electromagnetic directional control valve is connected to the first oil circuit to realize the liquid filling and protection of the accumulator; the first oil circuit includes oil passage 1, oil passage 2, oil passage 12 and oil passage 13. Among them, oil passage 1 is connected to oil passage 2, the two-position two-way electromagnetic directional control valve connects oil passage 1 and oil passage 13, one end of oil passage 12 is an oil return port, and the other end is connected to the two-position three-way electromagnetic directional control valve; A second oil circuit, the two-position three-way electromagnetic directional control valve is connected to the second oil circuit to realize parking brake; the second oil circuit includes oil passage 3, oil passage 4, oil passage 6 and oil passage 12; among them, one port of oil passage 3 is a parking brake oil port, and the other port is connected to the two-position three-way electromagnetic directional control valve; one port of oil passage 4 is connected to oil passage 3, and the other port is connected to a parking brake release pressure control switch; one port of oil passage 6 is connected to the fourth oil circuit, and the other port is connected to the two-position three-way electromagnetic directional control valve. The fourth oil circuit includes oil passage 9 and oil passage 12. Oil passage 9 and oil passage 12 are connected through a check valve. Oil passage 9 is connected to the accumulator, and the port of oil passage 6 is connected to oil passage 9 of the fourth oil circuit; A third oil circuit, the safety relief valve is connected to the third oil circuit to realize the pressure limit protection of the accumulator; the third oil circuit includes oil passage 2, oil passage 10 and oil passage 12; among them, one port of oil passage 2 is connected to the two-position three-way electromagnetic directional control valve, and the other port is connected to the two-position two-way electromagnetic directional control valve; one port of oil passage 10 is connected to the safety relief valve, and the other port is connected to oil passage 11; A fourth oil circuit, the check valve is connected to the fourth oil circuit to realize the liquid filling and pressure maintaining of the accumulator; the fourth oil circuit includes oil passage 9 and oil passage 11. One port of oil passage 11 is connected to one port of oil passage 9 through a check valve. The other port of oil passage 11 is an oil inlet, and the other port of oil passage 9 is connected to the accumulator.

2. The solenoid valve integrated device for the electronic parking brake of a forklift according to claim 1, characterized in that: It also includes a parking brake release pressure control switch, which is installed on the valve block and connected to the fourth oil circuit.

3. The solenoid valve integrated device for the electronic parking brake of a forklift according to claim 1 or 2, characterized in that: It also includes an accumulator liquid filling pressure control switch and an accumulator stop liquid filling pressure control switch. The accumulator liquid filling pressure control switch and the accumulator stop liquid filling pressure control switch are both installed on the valve block, and the accumulator liquid filling pressure control switch and the accumulator stop liquid filling pressure control switch are both respectively connected to the fourth oil circuit.

4. The solenoid valve integration device for the electronic parking brake of a forklift according to claim 1, characterized in that: An internal oil passage 1 and a two-way stop valve are arranged inside the two-position two-way electromagnetic directional control valve.

5. An electromagnetic valve integration device for an electronic parking brake of a forklift, as claimed in claim 1, wherein: An internal oil passage 2 and an internal oil passage 3 are arranged inside the two-position three-way electromagnetic directional control valve. The two-position three-way electromagnetic directional control valve realizes oil passage switching through the internal oil passage 2 and the internal oil passage 3.

6. The solenoid valve integrated device for the electronic parking brake of a forklift according to claim 2, characterized in that: The port of oil passage 9 is a liquid filling oil port connecting to the accumulator port.

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