Discharging hydraulic system of kitchen garbage truck

Abstract

The utility model discloses a kitchen garbage truck discharging hydraulic system which comprises an oil tank and an oil pump, and the oil tank and the oil pump are connected to an execution oil cylinder through a hydraulic oil way and an electromagnetic valve arranged on the oil way. The execution oil cylinder comprises a push shovel oil cylinder, and a rodless cavity and a rod cavity of the push shovel oil cylinder are connected to an oil way in parallel. Two throttling openings are formed between the rodless cavity of the push shovel oil cylinder and the oil tank and are the first throttling opening and the second throttling opening respectively. Differential connection can be achieved in the push-out process of the push shovel oil cylinder, so that the push-out speed of the push shovel oil cylinder is increased, and working efficiency is improved; oil cylinder return oil diversion can be achieved in the push shovel oil cylinder withdrawing process, the back pressure is reduced, the withdrawing speed is increased, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of sanitation vehicles, in particular to a material discharging hydraulic system of a kitchen garbage truck. Background Art

[0002] The discharge modes of the kitchen garbage truck are divided into push shovel discharge, spiral seal discharge, box tipping discharge, pneumatic discharge, etc. Among them, push shovel discharge and spiral seal discharge both use push shovel cylinders, and the structure of the push shovel cylinder is a double-acting multi-stage cylinder. The advantage of the multi-stage cylinder is the long stroke, and the disadvantage is that the area ratio of the rodless cavity to the rod cavity of the cylinder is large, and it is impossible to match the appropriate flow to meet both the flow required by the rodless cavity and the flow required by the rod cavity, resulting in a slow extension speed of the cylinder and a slow retraction speed due to the large back pressure of the rodless cavity oil return, which seriously affects the work efficiency and increases the system heat. Utility Model Content

[0003] The utility model aims to provide a hydraulic system for discharging kitchen garbage trucks to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a kitchen garbage truck discharging hydraulic system, comprising an oil tank and an oil pump, the oil tank and the oil pump are connected to an execution oil cylinder through a hydraulic oil circuit and a solenoid valve arranged on the oil circuit;

[0005] The execution oil cylinder comprises a push-blade oil cylinder, wherein the rodless chamber and the rod chamber of the push-blade oil cylinder are connected in parallel in the oil circuit;

[0006] Two throttle ports are arranged between the rodless chamber of the push shovel oil cylinder and the oil tank, namely, throttle port 1 and throttle port 2.

[0007] Preferably, the oil pump and the oil tank are connected to the push-blade oil cylinder via an unloading solenoid valve, a push-blade solenoid valve and a regeneration diversion solenoid valve.

[0008] Preferably, an oil return cut-off solenoid valve is also connected between the push-blade solenoid valve and the push-blade oil cylinder.

[0009] Preferably, a safety valve is also connected in parallel to the unloading solenoid valve.

[0010] Preferably, it also includes an auger motor, and two ends of the auger motor are respectively connected to the linkage solenoid valve, the pressure limiting valve and the auger solenoid valve.

[0011] Preferably, it also includes a rear door oil cylinder, and the oil circuit between the rear door oil cylinder, the oil tank and the oil pump is connected with a rear door solenoid valve and a balance valve.

[0012] Preferably, it also includes a gate valve cylinder, and the gate valve solenoid valve and a hydraulic lock are connected to the oil circuit between the gate valve cylinder and the oil tank and the oil pump.

[0013] Preferably, the solenoid valve is installed in an integrated manner, and a connecting port is provided on the integrated housing to connect with the oil pump, the oil tank, the actuator cylinder and the motor.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model can realize differential connection during the pushing out process of the push shovel oil cylinder to increase the pushing out speed of the push shovel oil cylinder and improve the work efficiency; and can realize oil return flow diversion during the retracting process of the push shovel oil cylinder to reduce the back pressure and increase the retracting speed and improve the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is the truth table of the electromagnet action of the utility model;

[0018] Figure 3 Simplify the oil circuit of the push shovel cylinder Figure 1 ;

[0019] Figure 4 Simplify the oil circuit of the push shovel cylinder Figure 2 ;

[0020] Figure 5 A simplified oil circuit connecting the push-blade cylinder and the auger motor Figure 2 . DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] As shown in the figure, this embodiment provides a hydraulic system for discharging food waste from a food waste truck, including an oil tank 1 and an oil pump 2. The oil tank 1 and the oil pump 2 are connected to an actuator cylinder via a hydraulic oil circuit and an electromagnetic valve provided on the oil circuit;

[0023] The execution cylinder includes a push-blade cylinder 13, wherein the rodless chamber and the rod chamber of the push-blade cylinder 13 are connected in parallel in the oil circuit;

[0024] There are two throttle ports between the rodless chamber of the push shovel oil cylinder 13 and the oil tank 1, namely, throttle port 1 3.1 and throttle port 2 3.2. Figure 1As shown, the oil pump 2 and the oil tank 1 are connected to the bulldozer cylinder 13 via the unloading solenoid valve 3, the bulldozer solenoid valve 5 and the regeneration diversion solenoid valve 7. The bulldozer solenoid valve 5 and the bulldozer cylinder 13 are also connected with the return oil cut-off solenoid valve 6. The unloading solenoid valve 3 is also connected in parallel with the safety valve 4. It also includes an auger motor 14, and the two ends of the auger motor 14 are respectively connected to the linkage solenoid valve 8, the pressure limiting valve 9 and the auger solenoid valve 10. It also includes a rear door cylinder 18, and the rear door solenoid valve 16 and the balance valve 17 are connected to the oil circuit of the rear door cylinder 18 and the oil tank 1 and the oil pump 2. It also includes a gate valve cylinder 15, and the gate valve solenoid valve 11 and the hydraulic lock 12 are connected to the oil circuit of the gate valve cylinder 15 and the oil tank 1 and the oil pump 2. The combination of solenoid valves is installed in an integrated manner, and a connection port is provided on the integrated housing to connect with the oil pump 2, the oil tank 1, the actuator cylinder and the motor.

[0025] The following steps are included:

[0026] Dozer shovel discharging steps: The working process includes opening the rear door, pushing out the dozer shovel, retracting the dozer shovel, and closing the rear door. At this time, the hydraulic circuits of the dozer shovel and the auger are connected in parallel, and the dozer shovel and the auger can move independently. When the electromagnet coils 1DT and 12DT are energized, the oil pump 2 draws oil from the oil tank 1, and the pressure oil of the oil pump 2 passes through the right position of the rear door solenoid valve 16 and the balance valve 17 to the rod chamber of the rear door cylinder 18, and the rodless chamber oil of the rear door cylinder 18 passes through the balance valve 17 and the right position of the rear door solenoid valve 16 back to the oil tank 1, controlling the opening of the rear door. After the rear door is fully opened, the electromagnet coils 1DT and 12DT lose power and stop moving; when the electromagnet coils 1DT, 2DT, and 10DT are energized, the oil pump 2 draws oil from the oil tank 1, and the pressure oil of the oil pump 2 passes through the left position of the bulldozer solenoid valve 5 to the rodless chamber of the bulldozer cylinder 13, and the rod chamber oil of the bulldozer cylinder 13 passes through the right position of the regeneration and diversion solenoid valve 7 back to the rodless chamber of the bulldozer cylinder 13 (separate extension flow regeneration process), controlling the bulldozer to be pushed out. After the bulldozer is fully pushed out, the electromagnet coils 1DT, 2DT, and 10DT lose power and stop moving ; The electromagnet coils 1DT, 3DT, and 9DT are energized, and the oil pump 2 draws oil from the oil tank 1. The pressure oil of the oil pump 2 passes through the right position of the bulldozer solenoid valve 5 to the rod chamber of the bulldozer cylinder 13, and the rodless chamber oil of the bulldozer cylinder 13 returns to the oil tank from the right position of the bulldozer solenoid valve 5 and the left position of the regeneration and diversion solenoid valve 7 at the same time (return oil diversion process), controlling the retraction of the bulldozer. After the bulldozer is retracted into place, the electromagnet coils 1DT, 3DT, and 9DT lose power and stop moving; the electromagnet coils 1DT and 11DT are energized, and the oil pump 2 draws oil from the oil tank 1, and the pressure oil of the oil pump 2 passes through the left position of the rear door solenoid valve 16 and the balance valve 17 to the rodless chamber of the rear door cylinder 18. The rod chamber oil of the rear door cylinder 18 passes through the balance valve 17 and the left position of the rear door solenoid valve 16 and returns to the oil tank 1, controlling the closing of the rear door. After the rear door is closed into place, the electromagnet coils 1DT and 11DT lose power and stop moving.

[0027] It is worth mentioning that the flow regeneration process is extended separately, refer to Figure 3 As shown: Because the power take-off limits the speed range of the oil pump and the flow rates required by different actuators vary greatly, the quantitative pump system cannot achieve a wide range of speed regulation. In order to meet the large flow rate required when the push-blade oil cylinder is extended, the utility model patent adopts a differential connection of the push-blade oil cylinder. The process is that the pressurized oil of the oil pump 2 enters the rodless chamber of the push-blade oil cylinder 13, and the return oil of the rod chamber of the push-blade oil cylinder 13 re-enters its rodless chamber, increasing the oil supply flow of the rodless chamber, increasing the extension speed, and improving work efficiency. In addition, refer to the return oil diversion process Figure 4 As shown, because the push-blade oil cylinder is a double-acting multi-stage oil cylinder, its area ratio ψ is very large. The pressure oil with a flow rate of Q1 is pressed into the rod chamber of the push-blade oil cylinder 13 from the oil pressure port of the oil pump 2, and its rodless chamber return oil flow rate Q2 is ψ times of Q1. Therefore, in the utility model patent, a throttle port 3.2 is bypassed on the basis of the throttle port 3.1, which is equivalent to increasing the return oil diameter, reducing the impact of system overflow caused by the large return oil back pressure, increasing the recovery speed, and improving work efficiency.

[0028] Spiral seal discharging steps: The working process includes opening the gate valve, opening the auger, pushing out the push shovel, retracting the push shovel, and closing the gate valve. At this time, the hydraulic circuits of the push shovel and the auger are connected in series, and the push shovel and the auger move synchronously. Electromagnetic coils 1DT and 8DT are energized, and oil pump 2 draws oil from oil tank 1. The pressure oil of oil pump 2 passes through the right position of gate valve solenoid valve 11 and hydraulic lock 12 to the rod chamber of gate valve cylinder 15. The rodless chamber oil of gate valve cylinder 15 passes through hydraulic lock 12 and the right position of gate valve solenoid valve 11 and returns to oil tank 1 to control the gate valve to open. After the gate valve is fully opened, electromagnet coils 1DT and 8DT lose power and stop moving; electromagnet coils 1DT, 4DT, 5DT, and 10DT are energized, and oil pump 2 draws oil from oil tank 1. The pressure oil of oil pump 2 passes through the left position of auger solenoid valve 10 and enters the B2 port and A2 port of auger motor 14. The return oil passes through the left position of linkage solenoid valve 8 and enters the rodless chamber of push shovel cylinder 13. The return oil of the rod chamber of push shovel cylinder 13 passes through the right position of regeneration and diversion solenoid valve 7 and returns to the rodless chamber of push shovel cylinder 13 (synchronous extension flow regeneration process) to control the opening of the auger. Start and push the bulldozer. When the bulldozer is pushed into place, the electromagnet coils 1DT, 4DT, 5DT, and 10DT lose power and stop moving; the electromagnet coils 1DT, 3DT, and 9DT are energized, the oil pump 2 draws oil from the oil tank 1, and the pressure oil of the oil pump 2 passes through the right position of the bulldozer solenoid valve 5 to the rod chamber of the bulldozer cylinder 13, and the oil in the rodless chamber of the bulldozer cylinder 13 returns to the oil tank from the right position of the bulldozer solenoid valve 5 and the left position of the regeneration and diversion solenoid valve 7 at the same time (return oil diversion process), to control the bulldozer to be retracted. After the bulldozer is retracted into place, the electromagnet coils 1DT, 3DT, and 9DT lose power and stop moving; the electromagnet coils 1DT and 7DT are energized, the oil pump 2 draws oil from the oil tank 1, and the pressure oil of the oil pump 2 passes through the left position of the gate valve solenoid valve 11 and the hydraulic lock 12 to enter the rodless chamber of the gate valve cylinder 15, to control the gate valve to be closed, and after the gate valve is closed into place, the electromagnet coils 1DT and 7DT lose power and stop moving.

[0029] During the flow regeneration process, the push shovel cylinder 13 and the auger motor 14 extend synchronously. Figure 5 As shown, the pressure oil of the oil pump 2 passes through the rodless chamber of the auger motor 14 and the push shovel cylinder 13 to control the synchronous extension of the auger motor 14 and the push shovel cylinder 13. At the same time, the return oil of the rod chamber of the push shovel cylinder 13 returns to the rodless chamber of the push shovel cylinder 13 through the differential connection, thereby accelerating the extension speed of the push shovel cylinder 13 and improving work efficiency.

[0030] 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 discharging food waste from a food waste truck, characterized in that: It comprises an oil tank (1) and an oil pump (2), wherein the oil tank (1) and the oil pump (2) are connected to an actuating oil cylinder via a hydraulic oil circuit and an electromagnetic valve arranged on the oil circuit; The execution oil cylinder comprises a push-blade oil cylinder (13), wherein the rodless chamber and the rod chamber of the push-blade oil cylinder (13) are connected in parallel to the oil circuit; Two throttle ports are arranged between the rodless chamber of the push shovel oil cylinder (13) and the oil tank (1), namely throttle port 1 (3.1) and throttle port 2 (3.2).

2. The hydraulic system for discharging food waste from a food waste truck according to claim 1, characterized in that: The oil pump (2) and the oil tank (1) are connected to the push-blade oil cylinder (13) via the unloading electromagnetic valve (3), the push-blade electromagnetic valve (5) and the regeneration diversion electromagnetic valve (7).

3. The hydraulic system for discharging food waste from a food waste truck according to claim 2, characterized in that: An oil return cut-off solenoid valve (6) is also connected between the push-blade solenoid valve (5) and the push-blade oil cylinder (13).

4. The hydraulic system for discharging food waste from a food waste truck according to claim 3, characterized in that: A safety valve (4) is also connected in parallel to the unloading electromagnetic valve (3).

5. The hydraulic system for discharging food waste from a food waste truck according to claim 4, characterized in that: It also includes an auger motor (14), and two ends of the auger motor (14) are respectively connected to a linkage electromagnetic valve (8), a pressure limiting valve (9) and an auger electromagnetic valve (10).

6. The hydraulic system for discharging food waste from a food waste truck according to claim 5, characterized in that: It also comprises a rear door oil cylinder (18), and a rear door solenoid valve (16) and a balance valve (17) are connected to the oil circuit between the rear door oil cylinder (18), the oil tank (1) and the oil pump (2).

7. The hydraulic system for discharging food waste from a food waste truck according to claim 6, characterized in that: It also comprises a gate valve oil cylinder (15), and the oil circuit between the gate valve oil cylinder (15), the oil tank (1) and the oil pump (2) is connected with a gate valve solenoid valve (11) and a hydraulic lock (12).

8. The hydraulic system for discharging food waste from a food waste truck according to claim 7, characterized in that: The electromagnetic valve is installed in an integrated manner, and a connection port is provided on the integrated housing for connecting with an oil pump (2), an oil tank (1), an actuator oil cylinder, and a motor.

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