Box type garbage truck and hydraulic system thereof

Abstract

The utility model discloses a box type garbage truck hydraulic system which comprises a gear pump, an oil tank, a tail door opening and closing reversing valve, a tail door opening and closing oil cylinder, a box body lifting reversing valve and a box body lifting oil cylinder. The box body lifting reversing valve controls the on-off of an oil way corresponding to the box body lifting oil cylinder through whether a DT3 coil and a DT4 coil are electrified or not, so that the lifting of the box body is controlled; and the device further comprises a first normally-open travel switch and a normally-closed travel switch, the normally-closed travel switch is connected with the DT4 coil, after the tail door is completely opened, the first normally-open travel switch is triggered to be switched on, and when the box body is lifted to the highest position, the normally-closed travel switch is switched off. According to the utility model, the sequential control function of opening the tail door and lifting the box body is realized, and a series of risks caused by collision of garbage on the tail door are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic systems for garbage trucks, and more specifically, to a box-type garbage truck and a hydraulic system thereof. Background Art

[0002] There is no sequence for opening the tailgate and lifting the box in the current van-type garbage trucks on the market. When the box is lifted, the compressed garbage blocks hit the tailgate, which may cause damage to the tailgate-related devices, severe vibration caused by the collision of the vehicle, or even a rollover caused by the center of gravity shifting backwards. Utility Model Content

[0003] 1. Technical problems to be solved

[0004] The purpose of the present application is to provide a hydraulic system for a box-type garbage truck to solve the problems raised in the above-mentioned background technology.

[0005] 2. Technical solution

[0006] A hydraulic system for a box-type garbage truck, comprising a gear pump, an oil tank, a tailgate opening and closing reversing valve, a tailgate opening and closing oil cylinder, a box body lifting reversing valve and a box body lifting oil cylinder, wherein the tailgate opening and closing reversing valve controls the opening and closing of the oil circuit corresponding to the tailgate opening and closing oil cylinder by whether the DT1 coil and the DT2 coil are energized, thereby controlling the opening and closing of the tailgate, and the box body lifting reversing valve controls the opening and closing of the oil circuit corresponding to the box body lifting oil cylinder by whether the DT3 coil and the DT4 coil are energized, thereby controlling the lifting of the box body;

[0007] It also includes a first normally open travel switch and a normally closed travel switch. The normally closed travel switch is connected to the DT4 coil. When the tailgate is fully opened, the first normally open travel switch is triggered to close. When the box is lifted to the highest point, the normally closed travel switch is disconnected.

[0008] As an optional solution to the technical solution of the present application document, it also includes a second normally open travel switch, which is connected to the DT5 coil of the two-position three-way solenoid valve, the P1 port of the two-position three-way solenoid valve is connected to the gear pump, and the A1 port of the two-position three-way solenoid valve is connected to the spring chamber C port of the box lifting and reversing valve.

[0009] As an optional solution to the technical solution of the present application document, the second normally open travel switch and the normally closed travel switch are arranged relative to each other at the highest lifting position of the box lifting cylinder.

[0010] As an optional solution to the technical solution of this application document, the tailgate opening and closing reversing valve and the box lifting reversing valve are installed integrally.

[0011] As an optional solution of the technical solution of this application document, the tailgate opening and closing reversing valve is connected to the tailgate opening and closing cylinder via the A1 port and the B1 port.

[0012] As an optional solution of the technical solution of this application document, the box lifting reversing valve is connected to the box lifting cylinder via the B2 port and the A2 port.

[0013] A box-type garbage truck adopts the above-mentioned box-type garbage truck hydraulic system.

[0014] 3. Beneficial effects

[0015] Compared with the prior art, the advantages of this application are:

[0016] The utility model solves the problem of the sequence control function of tailgate opening and box lifting, avoiding a series of risks caused by garbage hitting the tailgate; the maximum angle of box lifting can be freely controlled to avoid excessive box lifting angle; after the box is lifted to the controlled maximum angle, manual operation of the box lifting reversing valve to continue lifting the box is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a hydraulic system for a box-type garbage truck disclosed in a preferred embodiment of the present application. DETAILED DESCRIPTION

[0018] See also Figure 1 ,This application provides a technical solution:

[0019] A hydraulic system for a box-type garbage truck, comprising a gear pump 2, an oil tank 1, a tailgate opening and closing reversing valve 3, a tailgate opening and closing oil cylinder 5, a box body lifting reversing valve 4 and a box body lifting oil cylinder 6. The tailgate opening and closing reversing valve 3 controls the opening and closing of the oil circuit corresponding to the tailgate opening and closing oil cylinder 5 by whether the DT1 coil and the DT2 coil are energized, thereby controlling the opening and closing of the tailgate. The box body lifting reversing valve 4 controls the opening and closing of the oil circuit corresponding to the box body lifting oil cylinder 6 by whether the DT3 coil and the DT4 coil are energized, thereby controlling the lifting of the box body.

[0020] It also includes a first normally open travel switch 7 and a normally closed travel switch 8. The normally closed travel switch 8 is connected to the DT4 coil. When the tailgate is fully opened, the first normally open travel switch 7 is triggered to close. When the box is lifted to the highest point, the normally closed travel switch 8 is disconnected.

[0021] It also includes a second normally open travel switch 9, which is connected to the DT5 coil of the two-position three-way solenoid valve 10. The P1 port of the two-position three-way solenoid valve 10 is connected to the gear pump 2, and the A1 port of the two-position three-way solenoid valve 10 is connected to the spring chamber C port of the box lifting reversing valve 4.

[0022] In use, such as Figure 1 In the structure shown, gear pump 2 has been started:

[0023] The tailgate opens, the coil DT1 is energized, the tailgate opening and closing reversing valve 3 works in the lower position, the gear pump 2 draws oil from the oil tank 1, the pressurized oil P of the gear pump 2 enters the lower position of the tailgate opening and closing reversing valve 3, enters the rodless chamber of the tailgate opening and closing cylinder 5 through the A1 port, and the tailgate opens.

[0024] The box body is lifted. After the tailgate is fully opened, the normally open stroke switch 7 is closed, and the control circuit for lifting the box body can be connected to the coil DT4 of the box body lifting reversing valve 4 through the stroke switch 7 and the normally closed stroke switch 8. The upper position of the box body lifting reversing valve 4 works, and the pressure oil P of the gear pump 2 enters the upper position of the box body lifting reversing valve 4, and enters the rodless chamber of the box body lifting cylinder 6 through the B2 port, and the box body is lifted; on the contrary, the tailgate is not fully opened, the normally open stroke switch 7 cannot be closed, the coil DT4 cannot be energized, and the box body cannot be lifted.

[0025] The box lifting height limit, according to the above-mentioned box lifting process, when the box is lifted to the point where it can push the normally closed stroke switch 8, so that the originally closed stroke switch 8 is disconnected, then the coil DT4 of the box lifting reversing valve 4 loses power and the box cannot be lifted any further. The position of the normally closed stroke switch 8 can be adjusted according to the required lifting angle of the box to achieve the limit of the box lifting height.

[0026] To prevent the box from continuing to be lifted due to manual misoperation, no matter the box lifting is electronically controlled or manually operated, when the box is lifted to the set maximum angle, the normally open travel switch 9 is pushed to close the travel switch 9, and the coil DT5 of the two-position three-way solenoid valve 10 is energized, and the two-position three-way solenoid valve 10 works in the left position. When the box lifting and reversing valve 4 is manually operated to pre-set it to the upper working position, the gear pump 2 pressurized oil P enters the upper position of the box lifting and reversing valve 4 and is respectively connected to the B2 port and the P1 port of the two-position three-way solenoid valve 10. The P1 port is connected to the spring chamber C port of the box lifting and reversing valve 4 through the A1 port of the two-position three-way solenoid valve 10, and the operating handle of the box lifting and reversing valve 4 is quickly reset, and the box cannot be lifted any further, thereby further improving safety.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic system for a box-type garbage truck, characterized in that: The invention comprises a gear pump (2), an oil tank (1), a tailgate opening and closing reversing valve (3), a tailgate opening and closing oil cylinder (5), a box lifting reversing valve (4) and a box lifting oil cylinder (6); the tailgate opening and closing reversing valve (3) controls the opening and closing of the oil circuit corresponding to the tailgate opening and closing oil cylinder (5) by whether the DT1 coil and the DT2 coil are energized or not, thereby controlling the opening and closing of the tailgate; the box lifting reversing valve (4) controls the opening and closing of the oil circuit corresponding to the box lifting oil cylinder (6) by whether the DT3 coil and the DT4 coil are energized or not, thereby controlling the lifting of the box; It also includes a first normally open travel switch (7) and a normally closed travel switch (8). The normally closed travel switch (8) is connected to the DT4 coil. When the tailgate is fully opened, the first normally open travel switch (7) is triggered to close. When the box body is lifted to the highest point, the normally closed travel switch (8) is opened.

2. A hydraulic system for a box-type garbage truck according to claim 1, characterized in that: The invention also comprises a second normally open travel switch (9), the second normally open travel switch (9) is connected to the DT5 coil of the two-position three-way solenoid valve (10), the P1 port of the two-position three-way solenoid valve (10) is connected to the gear pump (2), and the A1 port of the two-position three-way solenoid valve (10) is connected to the C port of the spring chamber of the box lifting reversing valve (4).

3. A hydraulic system for a box-type garbage truck according to claim 2, characterized in that: The second normally open travel switch (9) is arranged relative to the normally closed travel switch (8) at the highest lifting position of the box lifting cylinder (6).

4. A hydraulic system for a box-type garbage truck according to claim 3, characterized in that: The tailgate opening and closing reversing valve (3) and the box lifting reversing valve (4) are integrated and installed.

5. The hydraulic system of a box-type garbage truck according to claim 1, characterized in that: The tailgate opening and closing reversing valve (3) is connected to the tailgate opening and closing oil cylinder via the A1 port and the B1 port.

6. A hydraulic system for a box-type garbage truck according to claim 5, characterized in that: The box lifting reversing valve (4) is connected to the box lifting oil cylinder via the B2 port and the A2 port.

7. A box-type garbage truck, characterized in that: A hydraulic system for a box-type garbage truck as described in any one of claims 1 to 6 is adopted.

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