Brake valve block hydraulic system

Abstract

The utility model provides a hydraulic system of a brake valve block, which is applied to winch brake of a crane and comprises a winch, a brake device connected with the winch, an oil way communication device, a two-way valve, an oil inlet and an oil tank, and the brake device is respectively connected with one end of the oil way communication device and one end of the two-way valve through one-way valves. According to the hydraulic control system of the winch, the electromagnetic valves which are connected in series are arranged in the hydraulic oil circuit, and the safety of the oil circuit for controlling the brake of the winch is improved. The hydraulic control system of the winch has the advantages that the electromagnetic valves which are connected in series are arranged in the hydraulic oil circuit, and the safety of the oil circuit for controlling the brake of the winch is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulics, and particularly relates to a hydraulic system of a brake valve block. Background Art

[0002] With the continuous innovative development of modern industry, the application of hydraulics is becoming more and more important. At present, the control of brakes through hydraulic systems is commonly used in rammer piles, workover rigs, cranes, etc. When a rammer pile is under construction, it is necessary to lift the rammer to a certain height and then release it freely to use its high impact to crush gravel, crushed stone, slag and other materials with good performance and strongly squeeze them into the foundation to form particle piles one by one in the foundation. The soil between the piles forms a composite foundation to improve the bearing capacity of the foundation and reduce settlement. Applying the control of the hydraulic system to the rammer pile can save a lot of manpower and time, and at the same time can reduce the potential safety hazards existing in manual operation during the operation. For example, the patent document with the Chinese patent application number 201821566927.1 and the publication date of April 16, 2019 discloses a hydraulic brake system, including an oil tank, a hydraulic pump, a brake valve, an electro-hydraulic proportional control valve block and a disc brake. The brake valve is respectively connected to the hydraulic pump and the disc brake. The brake valve is used to deliver the hydraulic oil delivered by the hydraulic pump to the disc brake. The electro-hydraulic proportional control valve block is respectively connected to the hydraulic pump and the disc brake. The electro-hydraulic proportional control valve block is used to deliver the hydraulic oil delivered by the hydraulic pump to the disc brake.

[0003] In the above-mentioned literature, by pressing the control button of the electro-hydraulic proportional control valve block, the hydraulic pump extracts hydraulic oil from the oil tank and delivers it to the disc brake through the electro-hydraulic proportional control valve block to achieve normal braking; then, by closing the brake valve in the state where the oil circuit is disconnected, the hydraulic pump extracts hydraulic oil from the oil tank and delivers it to the disc brake through the brake valve to achieve emergency braking; however, such a control of the hydraulic oil circuit has a high application cost, and in case of a failure, it may cause the brake of the winch not to hold, with low safety and high maintenance difficulty. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a hydraulic system of a brake valve block, which improves the safety of controlling the winch brake by the oil circuit by setting a solenoid valve connected in series in the hydraulic oil circuit, and the oil circuit is simply arranged and has a low application cost.

[0005] To achieve the above purpose, a hydraulic system of a brake valve block is applied to the winch brake of a crane and includes a winch, a brake device connected to the winch, an oil circuit connection device, an oil inlet and an oil tank. The hydraulic system further includes a two-way valve. The brake device is respectively connected to one end of the oil circuit connection device and one end of the two-way valve through a check valve. The other end of the oil circuit connection device is connected to the oil inlet through a pressure reducing valve. The other end of the two-way valve is connected to the oil tank;

[0006] The oil circuit connecting device includes solenoid valve 1 and solenoid valve 2. Solenoid valve 1 and solenoid valve 2 are connected in series. The P1 valve port of solenoid valve 1 is connected to the oil inlet. The A1 valve port of solenoid valve 1 is conductively connected to the P2 valve port of solenoid valve 2. The A2 valve port of solenoid valve 2 is respectively connected to the input end of the check valve and the upper end of the two-way valve. The output end of the check valve is respectively connected to the lower end of the two-way valve and the braking device. The T1 valve port of solenoid valve 1, the T2 valve port of solenoid valve 2, and the B valve port of the two-way valve are all connected to the fuel tank. When the check valve inputs oil to the braking device, the braking device is released.

[0007] With the above settings, by setting solenoid valve 1 and solenoid valve 2 in series connection, when controlling the hydraulic oil to release the brake of the braking device, it is necessary to control solenoid valve 1 and solenoid valve 2 to be energized simultaneously so that solenoid valve 1 and solenoid valve 2 are simultaneously conducted. Only in this way can the hydraulic oil passing through the pressure reducing valve flow through solenoid valve 1 and solenoid valve 2 to the check valve. And by setting the two-way valve to be connected to both ends of the check valve, the hydraulic oil pressure at both ends of the check valve is made equal, so that the hydraulic oil flows to the braking device to release the brake. When any one of the solenoid valves loses power, the oil pressure of the oil circuit connected to the braking device can be made greater than the oil pressure of the two-way valve. Then, the hydraulic oil in the oil circuit connected to the braking device is returned to the fuel tank through the two-way valve, thus realizing braking. Due to the series connection of solenoid valve 1 and solenoid valve 2, only when the two solenoid valves are simultaneously energized and commutated can the brake be released, and when any one of the solenoid valves loses power, the brake can be tightened. Therefore, during the process of controlling the hydraulic winch, it can be avoided that a single fault of the brake caused by an incorrect operation of one oil circuit in the control oil circuit leads to the incorrect release of the brake, thereby improving the safety of the oil circuit control winch brake.

[0008] Further, the braking device includes an oil storage tank, spring 1, a piston, and brake blocks. One end of spring 1 is fixed to the bottom of the oil storage tank, and the other end of spring 1 is fixedly connected to one end of the piston arranged in the oil storage tank. The other end of the piston is fixedly connected to the brake blocks. The brake blocks are in contact with the rotating shaft of the winch. The piston divides the interior of the oil storage tank into an upper oil storage chamber and a lower oil storage chamber 42, and the upper oil storage chamber is connected to the output end of the check valve.

[0009] With the above settings, when it is necessary to release the brake of the winch, it is convenient for the hydraulic oil to directly flow into the upper oil storage chamber through the check valve, thereby generating a downward force on the piston to compress spring 1, and then driving the piston to move downward, so that the brake blocks are separated from the rotating shaft of the winch to release the brake.

[0010] Further, a spring 2 and a connecting block are arranged inside the two-way valve. One end of spring 2 is fixedly connected to the top of the two-way valve, and the other end of spring 2 is fixedly connected to the connecting block. The connecting block divides the interior of the two-way valve into a first chamber and a second chamber.

[0011] With the above settings, after the liquid oil flows into the two-way valve, it can push the connecting block to compress or stretch the second spring, thereby adjusting the oil pressure of the oil circuit connected to the braking device.

[0012] Further, a B valve port is provided on one side of the first chamber. The B valve port is connected to the fuel tank. The input end of the one-way valve is connected to the upper end of the first chamber, and the lower end of the second chamber is connected to the output end of the one-way valve.

[0013] With the above settings, when braking is not required, by connecting the second chamber to the input end of the one-way valve and the output end of the one-way valve to the first chamber, the oil pressure passing through both ends of the one-way valve can be made equal. The liquid oil passing through the one-way valve directly flows into the upper oil storage chamber, generating a downward force on the piston to compress the first spring, thereby driving the piston to move downward, causing the brake block to disengage from the winch rotating shaft and releasing the brake; when braking is required, after disconnecting one of the solenoid valve 1 and the solenoid valve 2, the oil pressure in the second chamber connected to the input end of the one-way valve decreases, making the oil pressure in the first chamber greater than that in the second chamber. Then, it pushes the connecting block to move upward to compress the second spring. The liquid oil in the first chamber flows out from the B valve port, thereby reducing the oil pressure in the first chamber, making the hydraulic pressure in the upper oil storage chamber greater than the oil pressure in the first chamber. As a result, the liquid oil in the upper oil storage chamber flows into the first chamber through the oil circuit under the action of the first spring, and then flows back to the fuel tank through the B valve port. Then, the first spring pushes the piston upward to make the brake block abut against the rotating shaft of the winch, achieving braking.

[0014] Further, one end of the pressure reducing valve is connected to the oil inlet, and the other end of the pressure reducing valve is connected to the P1 valve port of the solenoid valve 1.

[0015] With the above settings, it is convenient to adjust the external oil pressure to the range that the braking device can withstand through the pressure reducing valve.

[0016] Further, both the solenoid valve 1 and the solenoid valve 2 are two-position three-way valves.

[0017] With the above settings, it is convenient to connect the input end and the output end by controlling the P port. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic hydraulic connection diagram of the present invention.

[0019] Figure 2 is Figure 1 the enlarged view at D in

[0020] Figure 3 is Figure 1 the enlarged view at E in

[0021] Figure 4 is Figure 1 the enlarged view at F in DETAILED DESCRIPTION OF THE INVENTION

[0022] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] As Figures 1 to 4 shown, a hydraulic system of a brake valve block includes a winch 1, a braking device connected to the winch 1, an oil circuit connection device, a two-way valve 6, an oil inlet 9, and a fuel tank 10. The braking device is connected to one end of the oil circuit connection device and one end of the two-way valve 6 through a check valve 11 respectively. The other end of the oil circuit connection device is connected to the oil inlet 9 through a pressure reducing valve 8. The other end of the two-way valve 6 is connected to the fuel tank 10.

[0024] As Figure 1 shown, the oil circuit connection device includes a solenoid valve one 71 and a solenoid valve two 72. The solenoid valve one 71 and the solenoid valve two 72 are connected in series. One end of the pressure reducing valve 8 is connected to the oil inlet 9, and the other end of the pressure reducing valve 8 is connected to the P1 valve port of the solenoid valve one 71. The A1 valve port of the solenoid valve one 71 is conductively connected to the P2 valve port of the solenoid valve two 72 to achieve series connection. In this way, only when the two solenoid valves are energized simultaneously can the hydraulic oil passing through the pressure reducing valve 8 pass through the two solenoid valves. Otherwise, the hydraulic oil passing through the pressure reducing valve 8 cannot pass through the solenoid valve one 71 and the solenoid valve two 72 to be connected to the braking device to release the brake. In this embodiment, both the solenoid valve one and the solenoid valve two are two-position three-way valves.

[0025] As Figures 2 - 4As shown in the figure, when the oil circuit of the one-way valve inputs oil to the braking device, the braking device is released. The braking device includes an oil storage tank 4, a first spring 51, a piston 5, and a brake block 3. One end of the first spring 51 is fixed to the bottom of the oil storage tank 4, and the other end of the first spring 51 is fixedly connected to one end of the piston 5 arranged in the oil storage tank 4. The other end of the piston 5 is fixedly connected to the brake block 3. The brake block 3 abuts against the rotating shaft 2 of the winch 1. The piston 5 divides the interior of the oil storage tank 4 into an upper oil storage chamber 41 and a lower oil storage chamber 42. The upper oil storage chamber 41 is connected to the output end of the one-way valve. Inside the two-way valve 6, there is a second spring 52 and a connecting block 7. One end of the second spring 52 is fixedly connected to the top of the two-way valve 6, and the other end of the second spring 52 is fixedly connected to the connecting block 7. The connecting block 7 divides the interior of the two-way valve 6 into a first chamber 61 and a second chamber 62. On one side of the first chamber 61, there is a B valve port, and the B valve port is connected to the fuel tank 10. The output end of the one-way valve 11 is connected to the upper end of the first chamber 61. The lower end of the second chamber 62 is respectively connected to the input end of the one-way valve and the A2 valve port of the solenoid valve two. The T1 valve port of the solenoid valve one 71, the T2 valve port of the solenoid valve two 72, and the B valve port of the two-way valve 6 are all connected to the fuel tank 10. In this way, when braking is not required, by connecting the second chamber 62 to the input end of the one-way valve 11 and connecting the output end of the one-way valve 11 to the first chamber 61, the oil pressures at both ends of the one-way valve 11 can be made equal, so that the hydraulic oil passing through the one-way valve 11 directly flows into the upper oil storage chamber 41, generating a downward acting force on the piston 5 to compress the first spring 51, thereby driving the piston 5 to move downward, causing the brake block 3 to disengage from the rotating shaft 2 of the winch 1 and releasing the brake. When braking is required, after disconnecting one of the solenoid valve one 71 and the solenoid valve two 72, the oil pressure in the second chamber 62 connected to the input end of the one-way valve 11 decreases, making the oil pressure in the first chamber 61 greater than the oil pressure in the second chamber 62. Then, the connecting block 7 is pushed upward to compress the second spring 52, and the hydraulic oil in the first chamber 61 flows out from the B valve port. As a result, the oil pressure in the first chamber 61 decreases, making the oil pressure in the upper oil storage chamber 41 greater than the oil pressure in the first chamber 61. Thus, the hydraulic oil in the upper oil storage chamber 41 flows into the first chamber 61 through the oil circuit under the action of the first spring 51, and then flows back to the fuel tank 10 through the B valve port. Then, the first spring 51 pushes the piston 5 upward, causing the brake block 3 to abut against the rotating shaft 2 of the winch 1 to achieve braking. In this embodiment, the oil inlet 9 is connected to an external oil pump (not shown in the figure).

[0026] Working principle of the utility model: When the brake needs to work, the hydraulic oil flows through the pressure reducing valve 11 via the oil inlet 9, and the oil pressure of the hydraulic oil is adjusted within the bearing range of the brake device. Then the hydraulic oil flows into the first electromagnetic valve 71, causing the first electromagnetic valve 71 and the second electromagnetic valve 72 to be energized simultaneously, making the first electromagnetic valve 71 and the second electromagnetic valve 72 conduct in series. The hydraulic oil flows through the first electromagnetic valve 71 and the second electromagnetic valve 72 in sequence to the one-way valve 11, and at the same time flows to the two-way valve 6 through the branch oil circuit. Both ends of the two-way valve 6 are connected to both ends of the one-way valve 11 respectively, making the oil pressures of the hydraulic oil flowing through both ends of the one-way valve 11 equal. Furthermore, the hydraulic oil flows to the brake device, and the oil pressure in the upper oil storage chamber 41 of the oil storage tank 4 in the brake device increases, so that the first spring 51 in the oil storage tank 4 is pressed down, and the piston 5 drives the brake block 3 to move downward, thus releasing the brake, and the winch 1 works normally; When the brake needs to stop working, if either the first electromagnetic valve 71 or the second electromagnetic valve 72 is de-energized or both are de-energized simultaneously, the oil pressure in the second chamber 62 connected to the A2 valve port of the second electromagnetic valve 72 can be reduced, making the oil pressure in the first chamber 61 greater than that in the second chamber 62, pushing the connecting block 7 to move upward to compress the second spring 52, and the hydraulic oil in the first chamber 61 flows out from the B valve port. Furthermore, the oil pressure in the first chamber 61 is reduced, and the oil pressure of the brake device is greater than that in the first chamber 61. Thus, the hydraulic oil of the brake device flows into the first chamber 61 through the oil circuit, and then flows back to the oil tank 10 through the B valve port. Finally, the oil pressure of the brake device becomes smaller, and the brake block 3 abuts against the rotating shaft 2 of the winch 1 to achieve braking.

Claims

1. A brake valve block hydraulic system, comprising a winch, a brake device connected to the winch, an oil circuit connecting device, an oil inlet and an oil tank, characterized in that: It also includes a two-way valve, wherein the brake device is connected to one end of the oil circuit connecting device and one end of the two-way valve through a one-way valve, the other end of the oil circuit connecting device is connected to the oil inlet through a pressure reducing valve, and the other end of the two-way valve is connected to the oil tank; The oil circuit connecting device includes a solenoid valve 1 and a solenoid valve 2, the solenoid valve 1 is connected in series with the solenoid valve 2, the P1 valve port of the solenoid valve 1 is connected to the oil inlet, the A1 valve port of the solenoid valve 1 is conductively connected to the P2 valve port of the solenoid valve 2, the A2 valve port of the solenoid valve 2 is respectively connected to the input end of the one-way valve and the upper end of the two-way valve, the output end of the one-way valve is respectively connected to the lower end of the two-way valve and the brake device, the T1 valve port of the solenoid valve 1, the T2 valve port of the solenoid valve 2 and the B valve port of the two-way valve are all connected to the oil tank, and the brake device is released when the one-way valve inputs the oil circuit to the brake device.

2. A brake valve block hydraulic system according to claim 1, characterized in that: The brake device includes an oil storage tank, a spring, a piston and a brake block. One end of the spring is fixed to the bottom of the oil storage tank, the other end of the spring is fixedly connected to one end of a piston arranged in the oil storage tank, the other end of the piston is fixedly connected to the brake block, the brake block abuts against the rotating shaft of the winch, and the piston divides the interior of the oil storage tank into an upper oil storage chamber and a lower oil storage chamber, and the upper oil storage chamber is connected to the other end of the one-way valve.

3. A brake valve block hydraulic system according to claim 1, characterized in that: A spring 2 and a connecting block are provided inside the two-way valve. One end of the spring 2 is fixedly connected to the top of the two-way valve, and the other end of the spring 2 is fixedly connected to the connecting block. The connecting block divides the inside of the two-way valve into a first chamber and a second chamber.

4. A brake valve block hydraulic system according to claim 3, characterized in that: A valve port B is provided on one side of the first chamber, the valve port B is connected to the oil tank, the input end of the one-way valve is connected to the upper end of the first chamber, and the lower end of the second chamber is connected to the output end of the one-way valve.

5. The brake valve block hydraulic system according to claim 1, characterized in that: One end of the pressure reducing valve is connected to the oil inlet, and the other end of the pressure reducing valve is connected to the P1 valve port of the solenoid valve 1.

6. A brake valve block hydraulic system according to claim 1, characterized in that: The solenoid valve 1 and the solenoid valve 2 are both two-position three-way valves.

Images