A hydraulic system for a mixing bowl

Abstract

A kind of mixing bowl hydraulic system, the oil inlet of pump is connected with oil tank, the oil outlet of pump is connected with host multiple-way reversing valve, motor reversing valve is equipped in host multiple-way reversing valve, motor reversing valve is connected with motor, oil passage between motor reversing valve and motor is also connected with mixing bowl control valve, mixing bowl control valve is connected with discharge port bin door oil cylinder, logic valve group is equipped at two oil ports of mixing bowl control valve and motor reversing valve, and logic valve group is used to ensure that the two oil ports of mixing bowl control valve close to motor reversing valve are import end oil port and oil outlet end oil port respectively, and remain unchanged.The mixing bowl hydraulic system of the present application does not need to change host, and material mixing bowl is directly connected with host to simultaneously realize the functions of single control motor forward and reverse rotation and discharge oil cylinder extension and contraction, that is, it is used immediately, and manual opening mixing bowl is not needed, so it is safer, and the functions of single control forward and reverse rotation and automatic discharge are realized, so it is more convenient and efficient.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system control technology for machinery, specifically a hydraulic system for a mixing hopper. Background Technology

[0002] A material mixing hopper is a multi-functional tool used on construction machinery such as small loaders and skid steer loaders. Mounted on the main unit of a small loader or skid steer loader, it integrates multiple functions such as loading, mixing, and transporting materials. It is simple to operate, convenient to transfer, and highly maneuverable, and is increasingly used in various industries such as construction and road building.

[0003] The working principle of a material mixing hopper: First, the material is loaded into the mixing hopper, and the mixing device inside the hopper mixes the material evenly. Then, the material is discharged from the mixing hopper. During the mixing process, the mixing device is prone to jamming by the material. The jamming material is cleared by reversing the rotation of the mixing device. Currently seen methods for discharging materials from mixing hoppers include: discharging by tilting the mixing hopper by the main unit; partial discharging by manually opening the discharging device; and automatic discharging by controlling the discharging device controller.

[0004] Currently available material mixing hoppers can only simultaneously perform one of the following functions: forward and reverse rotation of the mixing device or opening and closing of the discharge hopper door. They cannot simultaneously control both functions independently. Either they can only achieve forward and reverse rotation of the mixing device, requiring either tilting the hopper to discharge all material or manually opening the discharge hopper door. Tilting the hopper makes it difficult to control the volume of unloaded material, while manually opening the discharge hopper door is unsafe and inefficient. Alternatively, they can control the opening and closing of the hopper door, but they cannot achieve forward and reverse rotation of the mixing device. When the mixing device is jammed by material, it cannot be cleared by reversing the rotation.

[0005] Even on small loaders, the ability to individually control the forward and reverse rotation of the mixing unit and the opening and closing of the mixing hopper's discharge port can be achieved by increasing the number of connections to the main unit's multi-way directional valves. While this method achieves independent control of the mixing unit's forward and reverse rotation and the opening and closing of the mixing hopper's discharge port, it requires replacing the multi-way directional valves on the main unit, adding control devices, and modifying pipelines. This solution involves significant modifications to the main unit, resulting in high costs and difficult assembly and modification. Furthermore, due to space constraints and other issues, it is virtually impossible to achieve this function on skid steer loaders by simply adding control connections to the main unit's multi-way valves. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a hydraulic system for a mixing bucket that can realize the function of simultaneously and independently controlling the forward and reverse rotation of the mixing device and the opening and closing of the discharge port of the mixing bucket by directly connecting the mixing bucket to the main unit without modifying the main unit.

[0007] This invention is achieved through the following technical solution: a hydraulic system for a mixing hopper, comprising a pump, an oil tank connected to the pump's inlet, a main unit multi-way directional valve connected to the pump's outlet, a motor directional valve housed within the main unit multi-way directional valve, a motor directional valve connected to the motor directional valve, an oil circuit between the motor directional valve and the motor further connecting a mixing hopper control valve, a discharge port hopper cylinder connected to the mixing hopper control valve, and a logic valve group at the two oil ports connecting the mixing hopper control valve and the motor directional valve. The logic valve group is used to ensure that the two oil ports of the mixing hopper control valve near the motor directional valve are respectively the inlet and outlet ports of the discharge port hopper cylinder directional valve, and to keep the inlet and outlet ports of the discharge port hopper cylinder directional valve unchanged.

[0008] Furthermore, the motor reversing valve is a three-position six-way reversing valve.

[0009] The motor is a bidirectional motor.

[0010] The motor is connected to two bidirectional overflow valves at both ends.

[0011] The stirring bucket control valve includes a first oil passage, a second oil passage, a reversing valve, and a logic valve. The reversing valve is a three-position four-way reversing valve. The first oil passage and the second oil passage are respectively located on the two connecting oil lines of the motor reversing valve and the motor.

[0012] The logic valve includes a shuttle valve, a first check valve, and a second check valve. The shuttle valve connects a first oil passage, a second oil passage, and one port of a directional control valve. The other port of the directional control valve is connected to the first oil passage through the first check valve, and the other port of the directional control valve is connected to the second oil passage through the second check valve.

[0013] The conducting ends of the first and second check valves are connected to the reversing valve.

[0014] The two connecting oil lines between the reversing valve and the unloading port hopper cylinder are respectively equipped with a first throttle valve and a second throttle valve.

[0015] The present invention has the following advantages: The hydraulic system of the mixing bucket of the present invention does not require modification of the main unit. The material mixing bucket can be directly connected to the main unit to realize the functions of independently controlling the forward and reverse rotation of the motor and the extension and retraction of the unloading cylinder. It is ready to use immediately after connection. It is safer because there is no need to manually open the mixing bucket. It is more convenient and efficient to realize the functions of independently controlling the forward and reverse rotation and automatic unloading. Attached Figure Description

[0016] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0017] In the attached diagram: Figure 1 This is a hydraulic schematic diagram of the present invention; Figure 2 This is a schematic diagram of the stirring bucket control valve of the present invention; Figure 3 This is a structural diagram of the present invention.

[0018] In the diagram: 1. Oil tank, 2. Pump, 3. Main unit multi-way reversing valve, 31. Motor reversing valve, 4. Mixing bucket control valve, 41. First oil passage, 42. Second oil passage, 43. Shuttle valve, 44. First check valve, 45. Second check valve, 46. Reversing valve, 5. Motor, 6. Discharge port hopper cylinder, 7. Two-way overflow valve, 8. First throttle valve, 9. Second throttle valve.

[0019] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figures 1 to 3 The hydraulic system of the mixing bucket shown includes a pump 2, an oil tank 1 connected to the oil inlet of the pump 2, and a main unit multi-way directional valve 3 connected to the oil outlet of the pump 2. The main unit multi-way directional valve 3 is equipped with a motor directional valve 31, and a motor 5 is connected to the motor directional valve 31. The oil circuit between the motor directional valve 31 and the motor 5 is also connected to a mixing bucket control valve 4. The mixing bucket control valve 4 is connected to a discharge port hopper cylinder 6. A logic valve group is provided at the two oil ports of the mixing bucket control valve 4 connected to the motor directional valve 31. The logic valve group is used to ensure that the two oil ports of the mixing bucket control valve 4 near the motor directional valve 31 are respectively the inlet oil port and the outlet oil port of the discharge port hopper cylinder directional valve, and to keep the inlet and outlet oil ports of the discharge port hopper cylinder directional valve unchanged. The motor reversing valve of the present invention is connected to a stirring bucket control valve at the same time as the motor. The stirring bucket control valve is used to control the opening and closing of the discharge port hopper. Since a logic valve group is provided at the two oil ports connecting the stirring bucket control valve and the motor reversing valve, under the action of the logic valve group, the oil inlet and oil outlet of the discharge port hopper cylinder reversing valve of the stirring bucket control valve are not affected by the motor reversing valve and remain unchanged, so that the motor reversing and the opening and closing of the discharge port hopper do not interfere with each other and can operate independently.

[0024] like Figures 1 to 2 The hydraulic system of the mixing bucket shown is a three-position six-way directional valve 31. The motor 5 is a bidirectional motor. Bidirectional relief valves 7 are connected to both ends of the motor 5. The motor of this invention is a bidirectional motor, achieving reversal under the action of the motor directional valve. Simultaneously, bidirectional relief valves are provided at both ends of the bidirectional motor to ensure that the hydraulic oil pressure at the inlet of the bidirectional motor is at a safe value, thereby improving the safety of the entire system.

[0025] like Figures 1 to 2The hydraulic system of a mixing bucket shown includes a mixing bucket control valve 4 comprising a first oil passage 41, a second oil passage 42, a directional control valve 46, and a logic valve. The directional control valve 46 is a three-position four-way directional control valve. The first oil passage 41 and the second oil passage 42 are respectively located on two connecting oil lines of the motor directional control valve 31 and the motor 5. The logic valve includes a shuttle valve 43, a first check valve 44, and a second check valve 45. The shuttle valve 43 connects the first oil passage 41, the second oil passage 42, and one port of the directional control valve 46. The other port of the directional control valve 46 is connected to the first oil passage 41 via the first check valve 44, and the other port of the directional control valve 46 is connected to the second oil passage 42 via the second check valve 45. The conducting ends of the first check valve 44 and the second check valve 45 are connected together with the directional control valve 46. The first and second oil passages of this invention are two connecting pipelines of the motor and the motor reversing valve. The reversing valve is connected between the first and second oil passages. At the same time, the reversing valve is connected to the first and second oil passages through a logic valve. Under the action of the logic valve, the positions of the oil inlet and outlet of the reversing valve can be kept unchanged, so that the reversing valve is not affected by the oil inlet or outlet of the first and second oil passages. The logic valve specifically includes a shuttle valve, a first check valve and a second check valve. The shuttle valve is used to determine the end with higher oil pressure between the first and second oil passages and connects the end with higher oil pressure to the oil inlet of the reversing valve. The first check valve is set between the first oil passage and the oil outlet of the reversing valve, and the second check valve is set between the second oil passage and the oil outlet of the reversing valve. The conducting ends of the first and second check valves are connected to the oil outlet of the reversing valve. When the oil pressure of the first or second oil passage is low, the check valve connected to it is open, realizing the return of oil from the reversing valve.

[0026] like Figure 1 The hydraulic system of the mixing bucket shown has a first throttle valve 8 and a second throttle valve 9 respectively installed on the two connecting oil lines between the reversing valve 46 and the discharge port hopper cylinder 6. The discharge port hopper cylinder of this invention controls the opening and closing of the hopper door, requiring relatively low flow rate and pressure. A throttle valve is added at the cylinder port to control the cylinder's movement speed; preferably, a one-way throttle valve is used.

[0027] like Figures 1 to 2 The specific connection methods and usage procedures for each component of the hydraulic system of the mixing hopper shown are as follows: Connection method: Oil tank 1 is connected to the oil suction port of pump 2, the oil outlet of pump 2 is connected to the oil inlet P of motor reversing valve 31, and the oil return port T of motor reversing valve 31 is connected to oil tank 1.

[0028] One end of the first oil passage 41 of the mixing bucket control valve 4 is connected to port A3 of the motor reversing valve 31, and the other end is connected to port A of the motor 5; one end of the second oil passage 42 of the mixing bucket control valve 4 is connected to port B3 of the motor reversing valve 31, and the other end is connected to port B of the motor 5.

[0029] When the motor reversing valve 31 is operated so that oil flows out from port A3 and returns from port B3, the oil inlet P of the motor reversing valve 31 is connected to port A3, and the oil outlet B3 is connected to the oil return port T of the motor reversing valve 31. The oil from pump 1 flows through port A3 of the motor reversing valve 31 to the first oil passage 41 of the mixing bucket control valve 4. The oil from the first oil passage 41 of the mixing bucket control valve 4 flows to port A of motor 5. The oil returning from port B of motor 5 flows through the second oil passage 42 of the mixing bucket control valve 4 and port B3 of the motor reversing valve 31 to the oil return port T of the motor reversing valve 31 and then flows back to oil tank 1. At this time, motor 5 rotates in the forward direction, and motor 5 drives the mixing device, thus realizing the forward rotation of the mixing bucket mixing device.

[0030] When the motor reversing valve 31 is operated so that oil flows out from port B3 and returns from port A3, the oil inlet P of the motor reversing valve 31 is connected to port B3, and the oil outlet A3 is connected to the oil outlet T of the motor reversing valve 31. The oil from pump 1 flows through port B3 of the motor reversing valve 31 to the second oil passage 42 of the mixing bucket control valve 4. The oil from the second oil passage 42 of the mixing bucket control valve 4 flows to port B of the motor 5. The oil returning from port A of the motor 5 flows through the first oil passage 41 of the mixing bucket control valve 4 and port A3 of the motor reversing valve 31 to the oil outlet T of the motor reversing valve 31 and then flows back to the oil tank 1. At this time, the motor 5 rotates in the reverse direction, and the motor 5 drives the mixing device, thus realizing the reverse rotation of the mixing device in the mixing bucket.

[0031] The first oil inlet on the left side of the shuttle valve 43 inside the mixing bucket control valve 4 is connected to the first oil passage 41 of the mixing bucket control valve 4, the second oil inlet on the right side of the shuttle valve 43 is connected to the second oil passage 42 of the mixing bucket control valve 4, and the oil outlet of the shuttle valve 43 is connected to the oil inlet P4 of the reversing valve 46.

[0032] The reversing valve 46 is preferably a three-position four-way solenoid valve.

[0033] The A4 port of the reversing valve 46 is connected to the rodless chamber of the discharge port silo cylinder 6, and the B4 port of the reversing valve 46 is connected to the rod chamber of the discharge port silo cylinder 6. The return port T4 of the reversing valve 46 is simultaneously connected to the conducting end of the first check valve 44 and the conducting end of the second check valve 45.

[0034] The first check valve 44 is connected to the first oil passage 41 of the mixing bucket control valve 4 at its shut-off end, and the second check valve 45 is connected to the second oil passage 42 of the mixing bucket control valve 4 at its shut-off end.

[0035] How to use: When the motor rotates in the forward direction, oil enters through port A3 of the motor reversing valve 31 and returns through port B3. At this time, the motor 5 rotates in the forward direction, and the oil pressure in the first oil passage 41 of the stirring bucket control valve 4 is greater than the oil pressure in the second oil passage 42. The oil in the first oil passage 41 of the stirring bucket control valve 4 supplies oil to the inlet P4 of the reversing valve 46 through the first inlet port on the left side of the shuttle valve 43 and the outlet port of the shuttle valve 43. When the reversing valve 46 is in the left position, the inlet P4 of the reversing valve 46 is connected to port A4, and the outlet B4 is connected to the return port T4 of the reversing valve 46. The oil inlet is connected to the rodless chamber of the discharge port cylinder 6 via the inlet ports P4 and A4 of the reversing valve 46. The piston rod of cylinder 6 extends, and the oil in the rod chamber of cylinder 6 returns through port B4 and return port T4 of the reversing valve 46. The return port T4 of the reversing valve 46 is simultaneously connected to the conducting ends of the first check valve 44 and the second check valve 45. Because the pressure in the second oil passage 42 of the mixing bucket control valve 4 is low at this time, the oil in the return port T4 of the reversing valve 46 returns through the second check valve 45 to the second oil passage 42 of the mixing bucket control valve 4. Under this operating condition, the motor 5 rotates forward, the piston rod of the discharge port cylinder 6 extends, and the discharge port opens, thus realizing the function of the mixing device rotating forward while the mixing bucket door opens for unloading. When the right position of the reversing valve 46 is engaged, the oil inlet P4 of the reversing valve 46 is connected to B4, and the oil outlet A4 is connected to the oil return port T4 of the reversing valve 46. The oil in the first oil inlet on the left side of the shuttle valve 43 is connected to the rod chamber of the discharge port cylinder 6 through the oil inlet P4 and B4 of the reversing valve 46. The piston rod of the cylinder 6 retracts, and the oil in the rodless chamber of the cylinder 6 returns through the oil outlet A4 and the oil return port T4 of the reversing valve 46. The oil return port T4 of the reversing valve 46 is simultaneously connected to the conducting ends of the first check valve 44 and the second check valve 45. Since the pressure of the second oil passage 42 of the mixing bucket control valve 4 is low at this time, the oil in the oil return port T4 of the reversing valve 46 is connected to the second oil passage 42 of the mixing bucket control valve 4 through the second check valve 45 and returns. In this operating condition, motor 5 rotates in the forward direction, the piston rod of cylinder 6 of discharge port door retracts, and the discharge port door closes, thus realizing the function of the mixing device rotating in the forward direction while the mixing hopper door closes to stop discharging.

[0036] When the motor rotates in reverse, oil enters through port B3 of the motor reversing valve 31 and returns through port A3. At this time, the motor 5 rotates in reverse, and the oil pressure in the second oil passage 42 of the stirring bucket control valve 4 is greater than the oil pressure in the first oil passage 41. The oil in the second oil passage 42 of the stirring bucket control valve 4 is supplied to the inlet P4 of the reversing valve 46 through the second inlet port on the right side of the shuttle valve 43 and the outlet port of the shuttle valve 43. When the reversing valve 46 is in the left position, the inlet P4 of the reversing valve 46 is connected to A4, and port B4 is connected to the return port T4 of the reversing valve 46. The oil from the second side inlet is connected to the rodless chamber of the discharge port cylinder 6 via the inlet ports P4 and A4 of the reversing valve. The piston rod of cylinder 6 extends, and the oil in the rod chamber of cylinder 6 returns through port B4 and return port T4 of the reversing valve 46. The return port T4 of the reversing valve 46 is simultaneously connected to the conductive ends of the first check valve 44 and the second check valve 45. Because the pressure in the first oil passage 41 of the mixing bucket control valve 4 is low at this time, the oil in the return port T4 of the reversing valve 46 returns through the first check valve 44 and the first oil passage 41 of the mixing bucket control valve 4. Under this condition, the motor 5 rotates in reverse, the piston rod of the discharge port cylinder 6 extends, and the discharge port door opens, thus realizing the function of the mixing device rotating in reverse while the mixing bucket door opens for unloading. When the right position of the reversing valve 46 is engaged, the oil inlet P4 and B4 of the reversing valve 46 are connected, and the A4 port is connected to the return oil port T4 of the reversing valve 46. The oil in the second oil inlet on the right side of the shuttle valve 43 is connected to the rod chamber of the discharge port cylinder 6 through the oil inlet P4 and B4 of the reversing valve. The piston rod of the cylinder 6 retracts, and the oil in the rodless chamber of the cylinder 6 returns through the A4 port and the return oil port T4 of the reversing valve 46. The return oil port T4 of the reversing valve 46 is simultaneously connected to the conducting ends of the first check valve 44 and the second check valve 45. Since the pressure of the first oil passage 41 of the mixing bucket control valve 4 is low at this time, the oil in the return oil port T4 of the reversing valve 46 is connected to the first oil passage 41 of the mixing bucket control valve 4 through the first check valve 44 and returns. In this operating condition, motor 5 rotates in the reverse direction, the piston rod of cylinder 6 of discharge port door retracts, and the discharge port door closes, thus realizing the function of the motor stirring device rotating in the forward direction while the stirring hopper door closes to stop discharging.

[0037] The above design allows for the simultaneous independent rotation of the mixing device in both directions and the opening and closing of the material mixing hopper discharge port door. It also features a simple structure, convenient operation, and improved safety and applicability of the entire system.

[0038] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0039] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A hydraulic system for a mixing hopper, characterized in that: Includes a pump (2), the oil inlet of the pump (2) is connected to an oil tank (1), the oil outlet of the pump (2) is connected to a main unit multi-way reversing valve (3), the main unit multi-way reversing valve (3) is equipped with a motor reversing valve (31), the motor reversing valve (31) is connected to a motor (5), the oil circuit between the motor reversing valve (31) and the motor (5) is also connected to a stirring bucket control valve (4), the stirring bucket control valve (4) is connected to a discharge port hopper cylinder (6), the two oil ports connected to the stirring bucket control valve (4) and the motor reversing valve (31) are equipped with a logic valve group, the logic valve group is used to ensure that the two oil ports of the stirring bucket control valve (4) near the motor reversing valve (31) are respectively the inlet oil port and the outlet oil port, and remain unchanged; The stirring bucket control valve (4) includes a first oil passage (41), a second oil passage (42), a reversing valve (46), and a logic valve. The reversing valve (46) is a three-position four-way reversing valve. The first oil passage (41) and the second oil passage (42) are respectively located on the two connecting oil lines of the motor reversing valve (31) and the motor (5). The logic valve includes a shuttle valve (43), a first check valve (44), and a second check valve (45). The shuttle valve (43) is connected to a first oil passage (41), a second oil passage (42), and one port of a reversing valve (46). The other port of the reversing valve (46) is connected to the first oil passage (41) through the first check valve (44), and the other port of the reversing valve (46) is connected to the second oil passage (42) through the second check valve (45).

2. The hydraulic system for a mixing hopper as described in claim 1, characterized in that: The motor reversing valve (31) is a three-position six-way reversing valve.

3. The hydraulic system for a mixing hopper as described in claim 1, characterized in that: The motor (5) is a bidirectional motor.

4. The hydraulic system for a mixing hopper as described in claim 1, characterized in that: The motor (5) is connected to two bidirectional overflow valves (7) at both ends.

5. The hydraulic system for a mixing hopper as described in claim 1, characterized in that: The conducting ends of the first check valve (44) and the second check valve (45) are connected together with the reversing valve (46).

6. The hydraulic system for a mixing hopper as described in claim 1, characterized in that: The two connecting oil lines of the reversing valve (46) and the unloading port hopper cylinder (6) are respectively equipped with a first throttle valve (8) and a second throttle valve (9).

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