Self-resetting brake valve group, road roller brake system and road roller

Abstract

The utility model discloses a self-resetting brake valve group, a road roller brake system and a road roller, comprising a valve block provided with at least three oil ports including an oil inlet P, an oil return port T and an oil outlet P1; the first oil channel is located in the valve block and connected between the oil inlet P and the oil outlet P1, an electromagnetic reversing valve and a hand-operated reversing valve which are connected in series are installed on the first oil channel, and the hand-operated reversing valve is further connected with the oil inlet P through a port X; the second oil duct is located in the valve block and connected between the oil return port T and the oil outlet P1, and a safety valve is installed on the second oil duct; and the third oil channel is located in the valve block and connected between the oil return port T and the oil outlet P1, and a first one-way valve, a hand pump and a second one-way valve which are connected in series are installed on the third oil channel. According to the utility model, the operation difficulty of removing the mechanical braking of the brake and the operation difficulty of recovering the mechanical braking of the brake when the engine / hydraulic pump of the road roller breaks down are reduced, and the road roller is more efficient and convenient, and has the performance advantage of extremely high competitiveness.

Description

Technical Field

[0001] The utility model relates to a self-resetting brake valve group, a road roller braking system and a road roller machine, belonging to the field of road rollers. Background Art

[0002] There are two main solutions for releasing the brake function of the reducer / drive axle used in existing rollers through hydraulic oil:

[0003] Option 1: If Figure 1 As shown, a hydraulic pump is integrated with a solenoid reversing valve. When an electrical signal is applied, the solenoid reversing valve connects the oil passage between the hydraulic pump and the brake piston, allowing hydraulic oil to push the brake piston against the spring / disc spring pressing against it. When the brake piston disengages from the brake pad assembly, the pads lose contact, and the mechanical brake is released.

[0004] Option 2: If Figure 2 As shown, an external, two-position, three-way directional valve is installed. When an electrical signal is applied, the solenoid directional valve connects the oil passage between the hydraulic pump and the brake piston, allowing the hydraulic oil to push the brake piston against the spring / disc spring pressing against it. When the brake piston disengages from the brake pad assembly, the brake pads lose contact, and the mechanical brake is released.

[0005] In both of the above solutions, after the hydraulic oil is disconnected, the spring / disc spring pressing against the piston compresses the brake pads, resuming the mechanical braking state of the roller. However, if the engine or hydraulic pump fails, pressurized hydraulic oil can no longer be supplied, and hydraulic oil cannot be used to release the mechanical braking effect of the reducer / drive axle brakes.

[0006] Traditionally, manually releasing the mechanical brake function involves manually pulling the piston with a special bolt on the brake, overcoming the spring / disc spring force against the piston and disengaging the brake pads. This is complex to operate, and restoring the piston to its original position using the special bolt is challenging. Summary of the Invention

[0007] In view of the problems existing in the above-mentioned prior art, the utility model provides a self-resetting brake valve group, a road roller braking system and a road roller.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts a self-resetting brake valve group, comprising:

[0009] A valve block, wherein the valve block is provided with at least three oil ports, including an oil inlet P, an oil return port T and an oil outlet P1;

[0010] A first oil passage is located in the valve block and is connected between the oil inlet P and the oil outlet P1. A solenoid reversing valve and a manual reversing valve are installed in series on the first oil passage. The manual reversing valve is also connected to the oil inlet P through the X port.

[0011] The second oil passage is located in the valve block and connected between the oil return port T and the oil outlet P1. A safety valve is installed on the second oil passage;

[0012] The third oil passage is located in the valve block and connected between the oil return port T and the oil outlet P1. A first check valve, a hand pump and a second check valve are installed in series on the third oil passage.

[0013] As one embodiment, a damper is connected to the oil passage between the electromagnetic reversing valve and the manual reversing valve, and the other end of the damper is connected to the oil inlet P.

[0014] As one embodiment, the manual reversing valve is further connected to the oil return port T through a port.

[0015] As one embodiment, the electromagnetic reversing valve adopts a two-position three-way reversing valve, including a valve core and an electromagnetic coil. When the electromagnetic coil is energized, it pushes the valve core to move. When the electromagnetic coil is de-energized, the valve core is reset by a spring.

[0016] As one embodiment, the manual reversing valve adopts a two-position two-way reversing valve, including a valve core and a manual operating rod. The hydraulic oil acts on the X port of the valve core to connect the oil inlet P with the valve core oil channel; when there is no hydraulic oil, the valve core oil channel is disconnected by the manual operating rod.

[0017] As one embodiment, the hand pump is a plunger structure, including a plunger and an operating rod. The hand pump and one-way valve 1 and one-way valve 2 form a valve-controlled oil supply system. The manual reversing valve is manually disconnected, and manual reciprocating oil suction and oil pressure actions are performed through the operating rod of the hand pump.

[0018] The second aspect of the present invention further provides a road roller braking system, comprising a hydraulic pump, a hydraulic motor, a brake and a hydraulic oil tank, and also comprising the self-resetting brake valve group;

[0019] The oil inlet P of the self-resetting brake valve group is connected to the hydraulic pump, the oil outlet P1 is connected to the brake, and the oil return port T is connected to the hydraulic oil tank.

[0020] As one embodiment, the hydraulic pump and the hydraulic motor are plunger pumps and plunger motors used in a closed system.

[0021] As one embodiment, there are two hydraulic motors and two brakes. The two hydraulic motors are used to convert pressure energy into mechanical energy and drive the roller to move. The two brakes are integrated on the reducer / drive axle to provide braking torque for the roller.

[0022] The third aspect of the present invention further provides a road roller machine, on which the road roller braking system is installed.

[0023] Compared with the existing technology, the utility model reduces the difficulty of releasing the mechanical brake of the roller and the difficulty of restoring the mechanical brake of the brake when the engine / hydraulic pump fails. By improving the traditional brake release method, the difficulty of manually releasing the parking brake and the difficulty of manually restoring the parking brake are improved. It is more efficient and convenient and has highly competitive performance advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A hydraulic principle diagram for releasing the brakes of a conventional roller (Scheme 1);

[0026] Figure 2 A hydraulic principle diagram for releasing the brakes of a conventional roller (Scheme 2);

[0027] Figure 3 This is a hydraulic principle diagram of the braking system of the road roller of the present utility model;

[0028] Figure 4 This is a hydraulic principle diagram of the self-resetting brake valve group of the utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the self-resetting brake valve group of the utility model. Figure 1 ;

[0030] Figure 6 This is a schematic diagram of the structure of the self-resetting brake valve group of the utility model. Figure 2 ;

[0031] In the figure: 1. Hydraulic pump, 1-1. Brake valve 1, 2. Hydraulic motor 1, 3. Hydraulic motor 2, 4. Brake 1, 5. Brake 2, 6. Hydraulic oil tank, 7. Brake valve 2, 8. Self-resetting brake valve group, 8-1. Valve block, 8-2. Solenoid reversing valve, 8-3. Manual reversing valve, 8-4. Hand pump, 8-5. Safety valve, 8-6. One-way valve 1, 8-7. One-way valve 2, 8-8. Damping. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present application are described in detail below with the help of drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0033] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0034] like Figure 4 、 Figure 5 and Figure 6 As shown, a self-resetting brake valve group includes a valve block 8-1 and a plurality of oil passages arranged in the valve block 8-1;

[0035] The valve block 8-1 is provided with no less than three oil ports, including an oil inlet P, an oil return port T and an oil outlet P1;

[0036] The oil passage includes a first oil passage, a second oil passage, and a third oil passage. The first oil passage is located in the valve block 8-1 and connected between the oil inlet P and the oil outlet P1. The first oil passage is installed with a solenoid reversing valve 8-2 and a manual reversing valve 8-3 connected in series. The manual reversing valve 8-3 is also connected to the oil inlet P through the X port. The second oil passage is located in the valve block 8-1 and connected between the oil return port T and the oil outlet P1. The second oil passage is installed with a safety valve 8-5. The third oil passage is located in the valve block 8-1 and connected between the oil return port T and the oil outlet P1. The third oil passage is installed with a one-way valve 1 8-6, a hand pump 8-4, and a one-way valve 2 8-7 in series.

[0037] When the hydraulic pump 1 outputs pressurized hydraulic oil, the self-resetting brake valve group 8 can control the release and restoration of the brake function through electrical signals. When the hydraulic pump 1 is not working, the self-resetting brake valve group 8 can be manually operated to suck in hydraulic oil to release the brake function, and automatically switch back to the electrical control mode when the hydraulic pump resumes working.

[0038] In some embodiments, as Figure 4As shown, a damper 8-8 is connected to the oil passage between the electromagnetic reversing valve 8-2 and the manual reversing valve 8-3, and the other end of the damper 8-8 is connected to the oil inlet P. The damper 8-8 can unload the residual oil in the electromagnetic reversing valve 8-2 and the manual reversing valve 8-3 and flow it into the hydraulic oil tank 6 when the work stops.

[0039] In some embodiments, as Figure 4 As shown, the manual reversing valve 8 - 3 is also connected to the oil return port T through a port, so as to guide the oil leaked from the manual reversing valve 8 - 3 into the hydraulic oil tank 6 .

[0040] In some embodiments, the electromagnetic reversing valve 8-2 adopts a two-position, three-way reversing valve, including a valve core and an electromagnetic coil. When the electromagnetic coil is energized, it pushes the valve core to move. When the electromagnetic coil is de-energized, the spring resets the valve core. The manual reversing valve 8-3 adopts a two-position, two-way reversing valve, including a valve core and a manual operating lever. Hydraulic oil acts on the X port of the valve core, so that the oil inlet P is connected to the valve core oil channel. When there is no hydraulic oil, the valve core oil channel is disconnected by the manual operating lever. The hand pump 8-4 is a plunger structure, including a plunger and an operating lever. The hand pump 8-4, one-way valve 1 8-6, and one-way valve 2 8-7 form a valve-controlled oil supply system. The manual reversing valve 8-3 is manually disconnected, and the operating lever of the hand pump 8-4 is used to manually reciprocate the oil suction and pressure. The safety valve 8-5 is used to limit the maximum working pressure of the self-resetting brake valve group 8 to protect the brake.

[0041] In some specific embodiments, Figure 3 、 Figure 4 As shown, the solenoid reversing valve 8-2 is controlled by an electrical signal. When energized, the hydraulic oil at the oil inlet P flows through the solenoid reversing valve 8-2 to the manual reversing valve 8-3. When de-energized, the hydraulic oil at the oil inlet P is disconnected, and the hydraulic oil in the brake flows through the manual reversing valve 8-3 to the solenoid reversing valve 8-2, and then flows back to the hydraulic oil tank 6 through the oil return port T of the valve block 8-1.

[0042] When the hydraulic oil at the oil inlet P of the valve block 8-1 is under pressure, the manual reversing valve 8-3 operates in the connecting position, and the hydraulic oil flows through the manual reversing valve 8-3 to the oil outlet P1 of the valve block 8-1. When the hydraulic oil at the oil inlet P of the valve block 8-1 is under no pressure, the operating lever of the manual reversing valve 8-3 can be manually pushed to disconnect the passage between the manual reversing valve 8-3 and the electromagnetic reversing valve 8-2.

[0043] When the engine / hydraulic pump fails, the hydraulic oil at inlet P of valve block 8-1 is depressurized. Manually pushing the lever of manual reversing valve 8-3 disconnects it from the solenoid valve 8-2. Hand pump 8-4 then manually pumps oil to outlet P1 of valve block 8-1. Meanwhile, safety valve 8-5 acts as a pressure limiter, ensuring the system pressure remains at a safe level. When the engine / hydraulic pump resumes operation, the pressure at inlet P of valve block 8-1 controls manual reversing valve 8-3, returning it to the connected position. Braking is then controlled by solenoid valve 8-2.

[0044] The second aspect of the present invention is as follows Figure 3-Figure 6 As shown, a road roller braking system is also provided, comprising a hydraulic pump 1, a hydraulic motor, a brake and a hydraulic oil tank 6, and also comprising the self-resetting brake valve group 8;

[0045] The oil inlet P of the self-resetting brake valve group 8 is connected to the hydraulic pump 1 , the oil outlet P1 is connected to the brake, and the oil return port T is connected to the hydraulic oil tank 6 .

[0046] In some embodiments, the hydraulic pump 1 and the hydraulic motor are plunger pumps and plunger motors used in a closed system, and have very high power density.

[0047] In some embodiments, as Figure 3 As shown, there are two hydraulic motors and two brakes. Hydraulic motor 1 2 and hydraulic motor 2 3 are used to convert pressure energy into mechanical energy and drive the roller. Brake 1 4 and brake 2 5 are integrated on the reducer / drive axle to provide braking torque for the roller. Brake 1 4 and brake 2 5 work by releasing mechanical brakes with hydraulic oil. The main structures are brake pad assembly, piston, spring / disc spring, etc. During operation, hydraulic oil with a certain pressure is connected to the piston (sealed cavity) of the brake, pushing the piston to overcome the force of the spring / disc spring and move in the opposite direction of the brake pad assembly, so that the contact between the brake pads is disengaged and the mechanical brake is released.

[0048] In some specific embodiments, Figure 3 、 Figure 4As shown, when the solenoid reversing valve 8-2 on the self-resetting brake valve group 8 is energized, the solenoid reversing valve 8-2 operates in the left position, and the oil passage of the oil inlet P of the valve block 8-1 is connected to the outlet of the solenoid reversing valve 8-2; at the same time, the hydraulic oil in the oil passage of the oil inlet P of the valve block 8-1 acts on the hydraulic control port X of the manual reversing valve 8-3 through the internal oil passage of the valve block 8-1, pushing the manual reversing valve 8-3 to communicate; the hydraulic oil flows from the oil inlet P of the valve block 8-1 through the solenoid reversing valve 8-2 and the manual reversing valve 8-3, and then flows out from the oil outlet P1 of the valve block 8-1, acting on the pistons (sealed chambers) of brake 1 4 and brake 2 5, thereby releasing the mechanical braking state of the brake;

[0049] like Figure 4 As shown, when the solenoid reversing valve 8-2 on the self-resetting brake valve group 8 loses power, the solenoid reversing valve 8-2 operates in the right position under the action of the reset spring. At this time, the solenoid reversing valve 8-2 disconnects the oil passage of the oil inlet P of the valve block 8-1 from the manual reversing valve 8-3. At the same time, the hydraulic oil in the oil passage of the oil inlet P of the valve block 8-1 acts on the hydraulic control port X of the manual reversing valve 8-3 through the internal oil passage of the valve block 8-1, pushing the manual reversing valve 8-3 to operate in the communicating position. At this time, the manual reversing valve 8-3 is communicated with the oil return port T of the valve block 8-1.

[0050] The hydraulic oil in brake 1 4 and brake 2 5, under the action of the spring / disc spring, pushes the piston in the direction of releasing the brake pad group, and the brake returns to the mechanical braking state. The squeezed hydraulic oil flows through the manual reversing valve 8-3 and the right position of the electromagnetic reversing valve 8-2 to the return oil port T of the valve block 8-1 and flows back to the hydraulic oil tank 6.

[0051] like Figure 1 、 Figure 2 As shown, in the two traditional solutions, hydraulic pump 1 provides hydraulic oil at a certain pressure to brake 1 (4) and brake 2 (5). The flow of this oil is controlled by integrated brake valve 1-1 and external brake valve 2 (7), respectively. When hydraulic pump 1 is unable to provide pressurized hydraulic oil, traditional manual labor is required to release the mechanical brakes of brake 1 (4) and brake 2 (5). The conventional method involves pulling out the bolts connected to the brake piston, which drives the piston to overcome the force of the spring / disc spring, disengaging the brake pad assembly and releasing the mechanical brakes of the roller. To restore the mechanical brakes, the bolts on the pulled pistons are rotated back to their original positions.

[0052] The solution adopted by the present utility model is as follows: Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, when the hydraulic pump 1 cannot provide hydraulic oil of a certain pressure, there is no pressure on the hydraulic control port X of the manual reversing valve 8-3. At this time, the operating lever on the manual reversing valve 8-3 can be manually operated. By pressing the operating lever in, the manual reversing valve 8-3 can be switched to the off state.

[0053] The reciprocating downward and upward movement of the operating lever of hand pump 8-4, together with check valve 1 8-6 and check valve 2 8-7, forms a valve-controlled flow distribution system. This causes the plunger of hand pump 8-4 to draw oil from hydraulic tank 6 through return port T of valve block 8-1. The oil is then delivered to brake 1 4 and brake 2 5 through outlet port P1 of valve block 8-1, releasing the mechanical brakes. When hydraulic pump 1 resumes oil supply, hydraulic oil at a certain pressure flows through inlet port P of valve block 8-1 to hydraulic control port X of manual reversing valve 8-3, restoring the connection between manual reversing valve 8-3 and the system. At this point, the system's braking function returns to the state electrically controlled by solenoid reversing valve 8-2.

[0054] On the basis of the traditional hydraulic brake technology route (Scheme 1 and Scheme 2), the utility model adds a hand pump that can manually suck and discharge oil, and forms a valve-controlled oil supply system by cooperating with two one-way valves, so that the road roller brake can be manually supplied with oil to release the braking function of the brake when the hydraulic pump cannot provide pressurized hydraulic oil; and after the hydraulic pump resumes oil supply, the brake valve group automatically disconnects the manual control function and returns to electrical control.

[0055] The third aspect of the present invention further provides a road roller machine, on which the road roller braking system is installed.

[0056] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0057] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0058] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A self-resetting brake valve group, characterized in that: include: A valve block (8-1), wherein the valve block (8-1) is provided with no less than three oil ports, including an oil inlet P, an oil return port T, and an oil outlet P1; A first oil passage is located in the valve block (8-1) and is connected between the oil inlet P and the oil outlet P1. A solenoid reversing valve (8-2) and a manual reversing valve (8-3) are installed in series on the first oil passage. The manual reversing valve (8-3) is also connected to the oil inlet P via an X port. a second oil passage located in the valve block (8-1) and connected between the oil return port T and the oil outlet port P1, wherein a safety valve (8-5) is installed on the second oil passage; The third oil passage is located in the valve block (8-1) and connected between the oil return port T and the oil outlet P1. The third oil passage is equipped with a one-way valve (8-6), a hand pump (8-4) and a one-way valve (8-7) connected in series.

2. A self-resetting brake valve assembly according to claim 1, characterized in that: A damper (8-8) is connected to the oil passage between the electromagnetic reversing valve (8-2) and the manual reversing valve (8-3), and the other end of the damper (8-8) is connected to the oil inlet P.

3. The self-resetting brake valve assembly according to claim 1, characterized in that: The manual reversing valve (8-3) is also connected to the oil return port T through a port.

4. The self-resetting brake valve assembly according to claim 1, characterized in that: The electromagnetic reversing valve (8-2) adopts a two-position three-way reversing valve, comprising a valve core and an electromagnetic coil. When the electromagnetic coil is energized, it pushes the valve core to move, and when the electromagnetic coil is de-energized, the valve core is reset by a spring.

5. The self-resetting brake valve assembly according to claim 1, characterized in that: The manual reversing valve (8-3) adopts a two-position two-way reversing valve, comprising a valve core and a manual operating rod. Hydraulic oil acts on the X port of the valve core, so that the oil inlet P is connected to the valve core oil channel; when there is no hydraulic oil, the valve core oil channel is disconnected by the manual operating rod.

6. The self-resetting brake valve assembly according to claim 1, characterized in that: The hand pump (8-4) is a plunger structure, comprising a plunger and an operating rod. The hand pump (8-4) forms a valve-controlled oil supply system with a first one-way valve (8-6) and a second one-way valve (8-7). The manual reversing valve (8-3) is manually disconnected, and the operating rod of the hand pump (8-4) is used to perform manual reciprocating oil suction and oil pressure operations.

7. A road roller braking system comprising a hydraulic pump (1), a hydraulic motor, a brake and a hydraulic oil tank (6), characterized in that: Also includes the self-resetting brake valve assembly (8) according to any one of claims 1 to 6; The oil inlet P of the self-resetting brake valve group (8) is connected to the hydraulic pump (1), the oil outlet P1 is connected to the brake, and the oil return port T is connected to the hydraulic oil tank (6).

8. The road roller braking system according to claim 7, characterized in that: The hydraulic pump (1) and the hydraulic motor are plunger pumps and plunger motors used in a closed system.

9. The road roller braking system according to claim 7, characterized in that: There are two hydraulic motors and two brakes. The two hydraulic motors are used to convert pressure energy into mechanical energy and drive the roller to move. The two brakes are integrated on the reducer / drive axle to provide braking torque for the roller.

10. A road roller, characterized in that: The road roller is equipped with a road roller braking system according to any one of claims 7 to 9.

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