Electric floating mechanism of sliding dozer blade loader

Abstract

The invention discloses an electric floating mechanism of a sliding dozer blade loader, which relates to the technical field of sliding dozer blade loaders and comprises a high-precision oil way floating control electromagnetic switching valve, an oil return pipeline, a multi-way reversing valve, a hydraulic pipeline and a movable arm oil cylinder used for driving a sliding loading arm to lift, the high-precision oil way floating control electromagnetic switching valve is communicated with the multi-way reversing valve through a hydraulic pipeline; the multi-way reversing valve is of a multi-connected structure and is provided with a pressure oil inlet P, a multi-way reversing valve oil return opening T and a plurality of sets of oil conveying openings. The electromagnetic switching valve is adopted to replace a traditional pilot handle shuttle valve hydraulic control structure, the floating function is achieved in the mode that small current controls the auxiliary oil way, and the auxiliary oil way controls the main oil way, electromagnet failure caused by large-flow impact is avoided, the accessory cost is greatly reduced, and the hydraulic control system is suitable for small and medium-sized skid loaders.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of skid dozer loader, and particularly relates to an electric floating mechanism of a skid dozer loader. BACKGROUND

[0002] As a multipurpose operation equipment, the operation requirement of the skid loader has been transformed from the traditional material handling to "high precision, low damage and high efficiency", and one of the core requirements is to realize the "self-adaptive operation surface" function of the vertical arm driving the accessory, that is, through the automatic adjustment of the inlet and outlet flow of the boom cylinder, the height of the vertical arm is changed, the accessory is closely attached to the ground, manual active adjustment is not required, and the operation efficiency is improved.

[0003] The existing skid loader with a pilot operation function realizes the floating suction through the hydraulic control of the shuttle valve of the pilot handle: the pilot high pressure is generated by pushing the handle for the second time, the spool of the load-sensitive multi-way valve is moved for the second time, and then the floating suction is realized. Although this structure is simple to operate, it has obvious defects: first, the hydraulic curve matching is difficult, which leads to insufficient floating control precision; second, the cost of accessories is high, which is not suitable for small and medium-sized skid loaders; third, there is no effective misoperation protection mechanism, and the boom is easily lowered accidentally due to the misoperation of the driver, which causes safety hazards; fourth, it cannot be adjusted according to different working conditions (such as different specifications of the oil cylinder and different operation loads), and the boom is easily impacted when it is lowered too fast, which affects the operation stability and the service life of the equipment. SUMMARY

[0004] To solve the problems raised in the background art, the present application provides an electric floating mechanism of a skid dozer loader.

[0005] The object of the present application can be achieved by the following technical solutions: An electric floating mechanism of a skid dozer loader, comprising a high-precision oil path floating control electromagnetic switching valve, a return oil pipeline, a multi-way reversing valve, a hydraulic pipeline and a boom cylinder for driving the lifting of the skid loader arm, wherein, The high-precision oil path floating control electromagnetic switching valve is communicated with the multi-way reversing valve through the hydraulic pipeline; The multi-way reversing valve is of a multi-connection structure, and the multi-way reversing valve is provided with a pressure oil inlet P, a multi-way reversing valve return oil port T and multiple oil delivery ports, i.e., B1, A1, B2, A2, B3 and A3 oil delivery ports.

[0006] As a further optimization of the present technical solution, the high-precision oil path floating control electromagnetic switching valve comprises a switching valve body, an electromagnetic coil, a pilot oil port, a unloading valve core and a throttle hole, wherein, The switching valve body has a valve core channel, the electromagnetic coil is embedded on the outside of the switching valve body, and the pilot oil port, unloading valve core, and throttle hole are all integrated on the switching valve body.

[0007] As a further preferred embodiment of this technical solution: the boom cylinder is provided with a small cavity oil inlet C1, a small cavity oil outlet C2, a large cavity oil inlet D1, and a large cavity oil outlet D2.

[0008] As a further preferred embodiment of this technical solution: the switching valve body is provided with four docking interfaces, namely interface A, interface B, interface C and interface D, wherein, The A and B interfaces are respectively connected to the B2 and A2 of the multi-way directional valve; The C interface is connected to the small cavity oil inlet C1 and the small cavity oil outlet C2 of the boom cylinder via a hydraulic pipeline; The D interface is connected to the large cavity oil inlet D1 and the large cavity oil outlet D2 of the boom cylinder via hydraulic pipelines.

[0009] As a further preferred embodiment of this technical solution: the switching valve body is also provided with a switching valve return port, which is coaxially arranged with the unloading valve core and is used to connect with the return oil pipeline.

[0010] As a further preferred embodiment of this technical solution, the throttling orifice is a detachable structure.

[0011] Compared with the prior art, the beneficial effects of the present invention are: In this invention, an electromagnetic switching valve is used to replace the traditional pilot handle shuttle valve hydraulic control structure. The floating function is achieved by "small current controlling the auxiliary oil circuit and the auxiliary oil circuit controlling the main oil circuit". This avoids the failure of the electromagnet caused by large flow impact, greatly reduces the cost of parts, and is suitable for small and medium-sized skid steer loaders. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the high-precision oil circuit floating control electromagnetic switching valve of the present invention; Figure 2 This is a side view of the high-precision oil circuit floating control electromagnetic switching valve of the present invention; Figure 3 This is a schematic diagram showing the corresponding interfaces of the electromagnetic switching valve and the boom cylinder of the present invention. Figure 4 This is a schematic diagram of the structure and interface of the multi-way directional valve of the present invention; Figure 5 This is a schematic diagram showing the corresponding interfaces of the hydraulic switching valve and boom cylinder of the present invention.

[0013] Legend: 1. High-precision oil circuit floating control electromagnetic switching valve; 11. Switching valve body; 12. Electromagnetic coil; 13. Pilot port; 14. Unloading valve core; 15. Throttling orifice; 16. Connecting interface; 17. Switching valve return port; 2. Return oil pipeline; 3. Multi-way directional valve. Detailed Implementation

[0014] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Please see Figures 1-5 This application provides an electric floating mechanism for a skid steer bulldozer loader, including a high-precision hydraulic floating control solenoid switching valve 1, a return oil line, a multi-way directional valve 3, hydraulic lines, and a boom cylinder for driving the lifting and lowering of the skid steer loader boom. These are existing technologies, and only their use is permitted. The high-precision oil circuit floating control electromagnetic switching valve 1 is connected to the multi-way directional valve 3 through a hydraulic pipeline. The multi-way directional valve 3 has a multi-port structure. It includes a pressure oil inlet P, a multi-way directional valve return port T, and multiple sets of oil inlets, namely B1, A1, B2, A2, B3, and A3. The pressure oil inlet P is connected to the outlet of the oil source control valve, and the multi-way directional valve return port T is connected to the return oil pipeline. It should be noted that the switching valve return port 17 and the multi-way directional valve return port T share a common... The return oil line is connected to the oil tank integrated on the skid steer loader to relieve the pressure loss of the switching valve body 11 and the volume difference between the large and small chambers of the boom cylinder 6. The B1 and A1 oil inlets of the multi-way directional valve 3 are used to connect to the bucket cylinder of the skid steer loader, the B2 and A2 oil inlets are used to connect to the boom cylinder that controls the lifting and lowering of the skid steer loader boom, and the B3 and A3 oil inlets are used to connect to the side shift cylinder of the skid steer loader, so as to realize multi-action coordinated operation.

[0016] It should be emphasized that the high-precision oil circuit floating control solenoid switching valve 1 can be selected as a solenoid-type switching valve, as shown in the attached instruction manual. Figure 4 The hydraulic switching valve shown is as per the instruction manual. Figure 5 As shown, to facilitate the explanation of its connection relationship and principle, the following content uses the electromagnetic switching valve as shown in the instruction manual. Figure 4 The reference standard is shown below.

[0017] Furthermore, the high-precision oil circuit floating control electromagnetic switching valve 1 includes a switching valve body 11, an electromagnetic coil 12, a pilot oil port 13, an oil discharge valve core 14, and a throttle orifice 15, wherein, The switching valve body 11 has a valve core channel. The electromagnetic coil 12 is embedded on the outside of the switching valve body 11. It should be noted that the electromagnetic coil 12 is used to connect with the electronic control system integrated on the skid steer loader to control its working state. By receiving the signal from the electronic control system, it generates electromagnetic attraction to drive the valve core to move after being energized. The electronic control system is controlled by a set of self-locking rocker switches. When starting, the self-locking button must be opened in advance before the start switch can be pushed to prevent the driver from operating it by mistake, which could cause the boom to drop and cause personal injury. The pilot oil port 13, the unloading valve core 14, and the throttle orifice 15 are all integrated on the switching valve body 11. The pilot oil port 13 is a small-diameter interface that is connected to the pilot control oil circuit and is used to connect pilot oil to adjust the valve core opening. The unloading valve core 14 is used to control the opening and closing of the return oil channel.

[0018] Furthermore, the boom cylinder is provided with a small cavity oil inlet C1, a small cavity oil outlet C2, a large cavity oil inlet D1, and a large cavity oil outlet D2.

[0019] Furthermore, the switching valve body 11 is provided with four docking interfaces 16, namely interface A, interface B, interface C, and interface D. It should be noted that the names A, B, C, and D here are only for the convenience of illustrating the connection relationship. The A and B interfaces are respectively connected to the B2 and A2 of the multi-way directional valve; The C interface is connected to the small cavity oil inlet C1 and the small cavity oil outlet C2 of the boom cylinder via a hydraulic pipeline; The D interface is connected to the large cavity oil inlet D1 and the large cavity oil outlet D2 of the boom cylinder via hydraulic pipelines.

[0020] Furthermore, the valve body 11 of the switching valve is also provided with a switching valve return port 17, which is coaxially arranged with the unloading valve core 14 and is used to connect with the return oil pipeline.

[0021] Furthermore, the throttle orifice 15 is a detachable structure, and it is equipped with various orifice diameters. The orifice 15 can be replaced with one of suitable diameter according to the volume of the boom cylinder, and is used to limit the oil flow rate and prevent impact. The work process is as follows: Routine boom lifting operation: The self-locking rocker switch is in the locked state, the solenoid coil 12 is de-energized, the valve core channel is closed, and the driver operates the second control lever of the multi-way directional valve 3, which controls the B2 oil inlet and A2 oil inlet. The pressurized oil enters the small chamber of the boom cylinder through the A2 oil inlet → A interface → C interface → small chamber oil inlet C1. The large chamber oil enters through the large chamber oil outlet D2 → D interface → B interface → B2 oil inlet → multi-way directional valve return port T → oil tank of the skid steer bulldozer loader, and the boom in the vertical boom assembly is raised. Normal operation: The operator reverses the control lever, and the pressurized oil enters the large chamber of the boom cylinder through the B2 oil inlet → B interface → D interface → large chamber oil inlet D1. The small chamber oil enters the small chamber oil outlet C2 → C interface → A interface → A2 oil inlet → multi-way reversing valve return port T → oil tank, and the boom in the vertical boom assembly is raised. Floating operation: The driver toggles the self-locking rocker switch, unlocks it by dialing the switch, and presses the switch. The electromagnetic coil 12 is energized and engaged, making the A interface connected to the B interface and the C interface connected to the D interface. The small chamber oil inlet C1 and small chamber oil outlet C2 of the boom cylinder are connected to the large chamber oil inlet D1 and large chamber oil outlet D2. The closed pump with integrated DA valve outputs pilot oil at the set pressure, which enters the pilot oil port 13 through the pilot control oil circuit. The opening of the unloading valve core 14 is adjusted, the throttle orifice 15 limits the oil flow rate, and the switching valve return port 17 removes pressure loss and volume difference. The vertical boom assembly floats and fits against the working surface.

[0022] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. An electric floating mechanism for a skid steer bulldozer loader, characterized in that, This includes a high-precision hydraulic floating control solenoid switching valve (1), a return oil line, a multi-way directional valve (3), hydraulic lines, and a boom cylinder for driving the lifting and lowering of the sliding loading arm. The high-precision oil circuit floating control electromagnetic switching valve (1) is connected to the multi-way directional valve (3) through a hydraulic pipeline; The multi-way directional valve (3) is a multi-connection structure. The multi-way directional valve (3) is provided with a pressure oil inlet P, a multi-way directional valve return oil port T and multiple sets of oil supply ports, namely B1 oil supply port, A1 oil supply port, B2 oil supply port, A2 oil supply port, B3 oil supply port and A3 oil supply port.

2. The electric floating mechanism for a skid steer bulldozer loader according to claim 1, characterized in that, The high-precision oil circuit floating control electromagnetic switching valve (1) includes a switching valve body (11), an electromagnetic coil (12), a pilot oil port (13), an oil discharge valve core (14), and a throttle orifice (15), wherein, The valve body (11) of the switching valve is provided with a valve core channel. The electromagnetic coil (12) is embedded on the outside of the valve body (11). The pilot oil port (13), the unloading valve core (14), and the throttle hole (15) are all integrated on the valve body (11).

3. The electric floating mechanism for a skid steer bulldozer loader according to claim 2, characterized in that, The boom cylinder is equipped with a small cavity oil inlet C1, a small cavity oil outlet C2, a large cavity oil inlet D1, and a large cavity oil outlet D2.

4. The electric floating mechanism for a skid steer bulldozer loader according to claim 3, characterized in that, The switching valve body (11) is provided with four docking ports (16), namely port A, port B, port C and port D, wherein, The A and B interfaces are respectively connected to the B2 and A2 of the multi-way directional valve; The C interface is connected to the small cavity oil inlet C1 and the small cavity oil outlet C2 of the boom cylinder via a hydraulic pipeline; The D interface is connected to the large cavity oil inlet D1 and the large cavity oil outlet D2 of the boom cylinder via hydraulic pipelines.

5. The electric floating mechanism for a skid steer bulldozer loader according to claim 2, characterized in that, The switching valve body (11) is also provided with a switching valve return port (17), which is coaxially arranged with the unloading valve core (14) and is used to connect with the return oil pipeline.

6. The electric floating mechanism for a skid steer bulldozer loader according to claim 2, characterized in that, The throttling orifice (15) is a detachable structure.

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