Control system of lorry-mounted crane winch

Abstract

The utility model discloses a control system of a lorry-mounted crane winch. A shuttle valve is communicated with a first oil port, the shuttle valve is communicated with a second oil port, a sequence valve is communicated with a brake, the sequence valve is communicated with a second one-way valve when at a position I, the second one-way valve is communicated with an oil drainage pipeline L, an oil drainage port of a motor is communicated with the oil drainage pipeline L, and the brake is installed on the motor; when the load is lifted for the second time, the pressure oil in the reversing valve builds pressure and the pressure of the pressure oil in the reversing valve is lower than the set pressure of the sequence valve, the sequence valve is located at the position I, the pressure oil in the brake flows to the oil drainage pipeline L, the brake is in a closed state, the load is in a hovering state, and the hoisting load cannot slide down; when the built-up pressure of the pressure oil in the reversing valve is higher than the set pressure of the sequence valve, the sequence valve is located at the position II, the pressure oil of the sequence valve opens the brake, the torque output by the motor can overcome the gravity of the load at the moment, the problem that the hoisting load slides down when the winch is lifted for the second time is solved, and the micro-motion performance, the safety performance and the reliability performance of the winch are improved.

Description

Technical Field

[0001] This utility model relates to a control system for a truck-mounted crane winch, belonging to the field of lifting operation technology. Background Technology

[0002] A winch, also known as a hoist, is a small, lightweight lifting device that uses a drum to wind steel wire rope or other media to lift or pull heavy objects. Winches are generally equipped with safety protection devices to protect the winch when it is not in operation or in case of a sudden power source failure during operation. Currently, winch systems commonly use normally closed brakes. If the brake opens prematurely during a secondary lifting operation, and the system pressure is insufficient to support the load, the load may slip.

[0003] Existing technology provides a control method for the hydraulic system of a winch, which can protect the winch from automatically stopping when it is lifted to the upper limit or when it is overloaded, thereby ensuring the safety of the winch during operation. However, it does not mention a control scheme for secondary lifting. Another existing technology provides a scheme for a winch hydraulic system and a winch control system, which provides a scheme for secondary lifting of heavy objects and their sliding. However, it has many components, poses a risk to system reliability, increases costs, and has low practicality. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a control system for a truck-mounted crane winch. In this solution, when the pressure at port P gradually decreases and falls below the set pressure of the sequence valve, the sequence valve is in position I, and the control oil of the brake is connected to the drain line L. Then the brake turns to the closed state, that is, the load is still in the suspended state and the load will not slide down. This solves the problem of the load sliding down during the second lifting of the winch and improves the winch's micro-motion, safety performance and reliability. The balance valve set in this invention can increase the back pressure during the active descent of the load, ensuring the stability of the load during the descent process.

[0005] In a first aspect, this utility model provides a control system for a truck-mounted crane winch, including a first oil circuit, a second oil circuit, and a third oil circuit. The first oil circuit includes a first oil port, a balance valve, a first check valve, and a first load port. The second oil circuit includes a second oil port and a second load port. The third oil circuit includes a shuttle valve, a second check valve, a sequence valve, and a drain line L. The shuttle valve is connected to the first oil port and the second oil port. The sequence valve is connected to the brake. When the sequence valve is in position I, it is connected to the second check valve, and the second check valve is connected to the drain line L. The motor's drain port is connected to the drain line L. During the second lifting of the load, when the pressure oil in the directional valve builds up and the pressure oil pressure in the directional valve is lower than the set pressure of the sequence valve, the sequence valve is in position I. The pressure oil in the brake flows to the drain line L, the brake is closed, the load is in a suspended state, and the suspended load will not slide down. When the pressure oil in the directional valve builds up higher than the set pressure of the sequence valve, the sequence valve is in position II. The pressure oil in the sequence valve opens the brake, and at this time, the torque output by the motor can overcome the gravity of the load.

[0006] Prior to this, the pressure of the oil in the directional valve gradually decreases until it is lower than the set pressure of the sequence valve. When the sequence valve switches to position I, the pressure of the oil in the brake flows to the drain line L, the brake turns to the closed state, the load is in a suspended state, and the suspended load will not slide down.

[0007] Preferredly, a balance valve is included, which is connected in parallel with the first check valve; when the directional valve is in position II, the winch is used to lower the load; the pressure oil in the directional valve flows into the second load port C2, and the pressure oil in the directional valve flows from the shuttle valve to the sequence valve. When the pressure of the pressure oil in the directional valve gradually increases to the set pressure of the sequence valve, the sequence valve switches from position I to position II, and the pressure oil in the sequence valve flows into the brake, which opens; the pressure oil in the directional valve or the pressure oil in the shuttle valve opens the balance valve, the motor drives the winch to operate, and the load falls.

[0008] Preferred, when the directional valve is in position I, the winch is used for load lifting. The pressure oil in the directional valve flows into the first load port C1 of the motor through the check valve A7. The pressure oil in the directional valve flows from the shuttle valve to the sequence valve. When the pressure of the pressure oil in the directional valve gradually increases to the set pressure of the sequence valve, the sequence valve switches from position I to position II. The pressure oil in the sequence valve flows into the brake, the brake is opened, the motor drives the winch to operate, and the load is lifted by the winch.

[0009] Preferredly, a second check valve is included, through which the sequence valve is connected to the drain line L.

[0010] Preferred, the directional valve is a three-position four-way directional valve.

[0011] Prioritize connecting the drain line L to the oil tank.

[0012] The beneficial effects achieved by this utility model are:

[0013] When the pressure at port P is lower than the set pressure of the sequence valve, the sequence valve is in position I, and the control oil of the brake is connected to the drain line L. The brake then turns to the closed state, meaning the load remains suspended and the suspended weight will not slip. This solves the problem of the suspended weight slipping during the second lifting of the winch, and improves the winch's micro-motion, safety performance, and reliability. The balance valve in this invention can increase the back pressure during the active descent of the load, ensuring the stability of the load during descent. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 These are structural diagrams of some embodiments of this application;

[0016] The following are the meanings of the reference numerals in the attached diagram: A1 - Directional control valve; A2 - Shuttle valve; A3 - Balance valve; A4 - Sequence valve; A5 - Motor; A6 - Brake; A7 - First check valve; A8 - Second check valve. Detailed Implementation

[0017] To facilitate the explanation of the technical solution of this application, some concepts involved in this application will be explained first below.

[0018] It should be noted that if there are directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model, they are only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0019] Furthermore, if the descriptions in this utility model involve terms such as "first" and "second," they are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" and "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0020] See Figure 1This application discloses a control system for a truck-mounted crane winch, including a motor A5, a brake, and a control unit. The control unit includes a reversing valve A1, a balance valve A3, a sequence valve A4, a shuttle valve A2, a first check valve A7, and a second check valve A8. The reversing valve A1 is a three-position four-way reversing valve.

[0021] The control unit includes a first hydraulic circuit for lifting and a second hydraulic circuit for lowering. The first hydraulic circuit includes a first oil port V1, a balance valve A3, and a first lifting load port C1; the second hydraulic circuit includes a second oil port V2 and a second load port C2; the third hydraulic circuit includes a shuttle valve A2, a sequence valve A4, a brake hydraulic circuit, and a drain line.

[0022] The winch has three working states: lifting, holding, and lowering. When the three-position four-way directional valve A1 is in position I, the winch is used for load lifting. Pressurized oil flows from port P of the three-position four-way directional valve A1 to the first oil port V1, and then flows into the first load port C1 through the check valve A7. At the same time, oil flows from the shuttle valve A2 to the sequence valve A4. When the pressure at port P gradually increases to the set pressure of the sequence valve A4, the sequence valve A4 switches from position I to position II. Control oil flows into the brake A6, the brake A6 is opened, the motor drives the winch to operate, and the load is lifted.

[0023] When the three-position four-way directional valve A1 is in position II, the winch is used to lower the load. Pressurized oil flows from port P into the second port V2, then into the second load port C2. Simultaneously, it flows through branch port 1 and from shuttle valve A2 into sequence valve A4. As the pressure at port P gradually increases to the set pressure of sequence valve A4, sequence valve A4 switches from position I to position II, and control oil flows into brake A6, which is then opened. When flowing through branch port 3, pilot oil opens balance valve A3, and motor A5 drives the winch, lowering the load.

[0024] When the three-position four-way directional valve A1 is in the neutral position, the winch can be used for load suspension. At this time, the sequence valve A4 is in position I, the control oil of the brake A6 is connected to the drain line L, so the brake A6 is in the closed state, the motor A5 is braked, that is, the winch is braked, and the load is in the suspended state.

[0025] The scenario involves a suspended load being lifted a second time. When the three-position four-way directional valve A1 is in position I, the winch is used for load lifting. Pressure oil flows from port P to the first oil port V1, through the first check valve A7 into the first load port C1. Simultaneously, oil flows from shuttle valve A2 to sequence valve A4. As the pressure at port P gradually rises to the set pressure of sequence valve A4, sequence valve A4 switches from position I to position II, and control oil flows into brake A6. Brake A6 is then opened. At this point, the torque generated by the motor is sufficient to overcome the load, and motor A5 drives the winch, lifting the load. Specifically, when the pressure at port P gradually decreases and falls below the set pressure of sequence valve A4, sequence valve A4 is in position I, and the control oil of brake A6 is connected to the drain line L. Brake A6 then closes, meaning the load remains suspended and the suspended load will not slip. Therefore, this solution can solve the problem of the suspended load slipping during the second lifting operation of the winch.

[0026] There are many models of the reversing valve A1, shuttle valve A2, balance valve A3, sequence valve A4, motor A5, brake A6, first check valve A7, and second check valve A8 that can be used in the prior art. Those skilled in the art can select according to actual needs. No examples will be given in this embodiment.

[0027] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0028] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

[0029] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this application. It should be understood that the above are only specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of this application should be included within the scope of protection of this application.

Claims

1. A control system for a truck-mounted crane winch, characterized in that, It includes a first oil circuit, a second oil circuit, and a third oil circuit. The first oil circuit includes a first oil port (V1), a balance valve (A3), a first check valve (A7), and a first load port (C1). The second oil circuit includes a second oil port (V2) and a second load port (C2). The third oil circuit includes a shuttle valve (A2), a second check valve (A8), a sequence valve (A4), and a drain line L. The shuttle valve (A2) is connected to the first oil port (V1), and the shuttle valve (A2) is connected to the second oil port (V2). The sequence valve (A4) is connected to the brake (A6). When the sequence valve (A4) is in position I, it is connected to the second check valve (A8). The second check valve (A8) is connected to the drain line L. The drain port of (A5) is connected to the drain line L; when the load is lifted for the second time, when the pressure oil in the reversing valve (A1) is pressurized and the pressure oil pressure in the reversing valve (A1) is lower than the set pressure of the sequence valve (A4), the sequence valve (A4) is in position I, the pressure oil in the brake (A6) flows to the drain line L, the brake (A6) is closed, the load is in a suspended state, and the load will not slide down; when the pressure oil in the reversing valve (A1) is higher than the set pressure of the sequence valve (A4), the sequence valve (A4) is in position II, and the brake (A6) is opened by the pressure oil in the sequence valve (A4). At this time, the torque output by the motor (A5) can overcome the gravity of the load.

2. The control system for a truck-mounted crane winch according to claim 1, characterized in that, When the load is suspended in mid-air and is lifted a second time, the pressure oil in the directional valve (A1) flows into the first load port C1 of the motor (A5) through the first check valve (A7). The pressure oil in the directional valve (A1) flows into the sequence valve (A4) through the shuttle valve (A2). When the pressure of the pressure oil in the directional valve (A1) gradually increases to the set pressure of the sequence valve (A4), the sequence valve (A4) switches from position I to position II, so that the pressure oil flows into the brake (A6). The brake (A6) opens, and the torque generated by the motor (A5) is greater than the load weight. The motor (A5) drives the winch to operate, and the load is lifted.

3. The control system for a truck-mounted crane winch according to claim 1, characterized in that, Includes a balance valve (A3), which is connected in parallel to the first check valve (A7); when the directional valve (A1) is in position II, the winch is used for load lowering; the pressure oil in the directional valve (A1) flows into the second load port C2, and the pressure oil in the directional valve (A1) flows from the shuttle valve (A2) to the sequence valve (A4). When the pressure of the pressure oil in the directional valve (A1) gradually increases to the set pressure of the sequence valve (A4), the sequence valve (A4) switches from position I to position II, and the pressure oil in the sequence valve (A4) flows into the brake (A6), and the brake (A6) opens; The pressure oil in the directional valve (A1) or the pressure oil in the shuttle valve (A2) opens the balance valve (A3), and the motor (A5) drives the winch to operate, causing the load to fall.

4. The control system for a truck-mounted crane winch according to claim 1, characterized in that, When the directional valve (A1) is in position I, the winch is used for load lifting. The pressure oil in the directional valve (A1) flows into the first load port C1 of the motor (A5) through the check valve A7. The pressure oil in the directional valve (A1) flows from the shuttle valve (A2) to the sequence valve (A4). When the pressure of the pressure oil in the directional valve (A1) gradually increases to the set pressure of the sequence valve (A4), the sequence valve (A4) switches from position I to position II. The pressure oil in the sequence valve (A4) flows into the brake (A6), the brake (A6) is opened, the motor (A5) drives the winch to operate, and the load is lifted by the winch.

5. The control system for a truck-mounted crane winch according to claim 1, characterized in that, Includes a second check valve (A8), and a sequence valve (A4) is connected to the drain line L through the second check valve (A8).

6. A control system for a truck-mounted crane winch according to any one of claims 1-4, characterized in that, The directional valve (A1) is a three-position four-way directional valve.

7. The control system for a truck-mounted crane winch according to claim 1, characterized in that, The drain line L connects to the oil tank.

Images