Multi-way valve group safety control device for forklift and reach forklift

Abstract

The utility model provides a multi-way valve group safety control device for a forklift and a reach forklift, which comprises a multi-way valve group, a plurality of valve cores are arranged in the multi-way valve group, and the multi-way valve group is connected with an oil tank through an oil port; the control mechanism comprises a control handle, a control element and an oil way, and the control handle is connected with any valve element in the multi-way valve group through a connecting structure so as to control the movement of the valve element; the first end of the control element is connected with the valve element, the second end of the control element is connected with the oil way, the oil way is further connected with an oil cylinder, and the control element is used for cutting off connection between the multi-way valve set and the oil way when the forklift is powered off or a driver leaves a seat. By additionally arranging the independent external control element, when the forklift is powered off or a driver leaves a seat, the control element can automatically cut off connection between the multi-way valve set and the oil way, it is ensured that hydraulic oil cannot flow back to the multi-way valve set, and therefore accidental descending of the lifting oil cylinder and goods is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a forklift technical field especially relates to a forklift is with multichannel valve group safety control device and front -moving formula forklift. BACKGROUND

[0002] In the existing forklift technology, the lowering function of the forklift is mainly controlled by the operating handle of the multichannel valve, and the action of the operating handle is completely realized by the manual operation of the operator. It needs to be particularly pointed out that even if the forklift power is cut off, if the operator himself or other personnel accidentally touches the operating handle, it may still cause the sudden lowering of the oil cylinder driven goods. This lowering process lacks the necessary safety protection mechanism, that is, the unexpected lowering action of the forklift goods is possible without human control intention intervention. And this unexpected lowering action of the goods is extremely likely to cause a series of safety accidents, which brings potential risks and hazards to the operating personnel and the surrounding environment. Based on this, the utility model aims at this problem to put forward an effective solution to significantly improve the safety of the forklift operation process. SUMMARY

[0003] In order to solve all or part of the problems of the above prior art, the utility model provides a forklift multichannel valve group safety control device and front -moving formula forklift, by adding independent external control element, can effectively cut off the hydraulic oil circuit, so as to ensure that the hydraulic oil in the lifting cylinder does not flow back to the multichannel valve group when the forklift is powered off or the driver leaves the seat.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] A forklift multichannel valve group safety control device, comprising:

[0006] A multichannel valve group is internally provided with a plurality of valve cores, and the multichannel valve group is connected with an oil tank through an oil port;

[0007] At least one set of control mechanism, the control mechanism includes an operating handle, a control element and an oil circuit, the operating handle is connected with any valve core in the multichannel valve group through a connecting structure to control the movement of the valve core, the first end of the control element is connected with the valve core, and the second end is connected with the oil circuit, the oil circuit is further connected with a cylinder, and the control element is used to cut off the connection between the multichannel valve group and the oil circuit when the forklift is powered off or the driver leaves the seat.

[0008] The control element is a solenoid valve, the solenoid valve is provided with a first oil port and a second oil port, the first oil port is connected with the valve core in the multichannel valve group through a connecting structure, and the second oil port is connected with the oil circuit through a connecting structure.

[0009] The electromagnetic valve is connected with a current control switch, and the opening and closing of the internal valve are realized by the on-off of the current control switch.

[0010] The current control switch is installed on the driver seat of the forklift.

[0011] The control element is a manual stop valve, and the safety control device further comprises a sensor and an alarm arranged in the driver cabin of the forklift, the sensor is used for detecting whether the forklift is powered off and whether the driver leaves the seat, and when the sensor detects that the forklift is powered off or the driver leaves the seat, the alarm sends a prompt signal.

[0012] The multi-way valve group is provided with at least four valve cores, each of the valve cores corresponds to a set of control mechanisms, the corresponding control handle is pushed to drive the corresponding valve core to move, so as to control the on-off of the corresponding oil way.

[0013] The oil way comprises at least a lifting oil way, a tilting oil way or a side shifting oil way, and is respectively connected with a lifting oil cylinder, a tilting oil cylinder or a side shifting oil cylinder.

[0014] The oil way is a lifting oil way and is connected with a lifting oil cylinder, when lifting, hydraulic oil flows from the multi-way valve group to the second end of the control element through the first end, flows into the lifting oil cylinder through the lifting oil way to realize lifting, and when descending, hydraulic oil flows from the lifting oil cylinder to the second end of the control element through the lifting oil way, and then returns to the multi-way valve group through the first end and flows back to the oil tank.

[0015] The control element is connected with the multi-way valve group and the oil way through a transition joint.

[0016] The utility model further provides a front moving type forklift which comprises a vehicle body and the multi-way valve group safety control device for forklifts.

[0017] The utility model has at least the following beneficial effects:

[0018] 1) by adding an independent external control element, the utility model effectively prevents the sudden descending of the lifting oil cylinder and goods caused by accidental touching of the control lever, when the forklift is powered off or the driver leaves the seat, the control element can automatically cut off the connection between the multi-way valve group and the oil way, so that the hydraulic oil cannot flow back to the multi-way valve group, thereby avoiding the accidental descending of the lifting oil cylinder and goods. This design greatly reduces the risk of safety accidents caused by operation errors and equipment failures, and ensures the safety of the operator and the surrounding environment.

[0019] 2) The design of the control element is not only suitable for new forklifts, but also has wide applicability and can be used with multi-way valve groups of almost all models of forklifts, and even old forklifts can be safely modified. The working principle of the electromagnetic valve is simple, easy to implement, and low in cost. After the actual verification of multiple batches of forklift modifications, it shows a significant safety improvement effect. This economical and effective solution provides feasibility for the safety modification of forklifts, ensuring that the hydraulic oil circuit is cut off in time under various operating environments, thereby effectively reducing potential safety risks. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a multi-way valve group safety control device for a forklift according to an embodiment of the present application.

[0022] Figure 2 The principle diagram of the control element provided in the embodiment of the present application is shown in FIG. 2. Figure 1

[0023] Reference signs: 1, multi-way valve group; 2, control mechanism; 201, control handle; 202, control element; A, first oil port; B, second oil port; 203, oil circuit. DETAILED DESCRIPTION

[0024] The technical solutions in the specific embodiments of the present application will be described in detail below. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] The implementation of the present application will be described in detail below in combination with specific embodiments.

[0026] Embodiment 1

[0027] In the embodiment of the present application, reference is made to Figures 1 to 2 ​As shown, a safety control device for a forklift multi-way valve group is provided. The device includes a multi-way valve group 1 with multiple spools inside, and the multi-way valve group 1 is connected to the oil tank through the oil port to realize the flow and control of hydraulic oil. The device also includes at least one set of control mechanism 2, which is composed of a control handle 201, a control element 202 and an oil circuit 203. The control handle 201 is connected to any spool in the multi-way valve group 1 through the connecting structure, so as to accurately control the movement of the spool. The first end of the control element 202 is connected to the spool, and the second end is connected to the oil circuit 203, which is further connected to the oil cylinder. The design of the control element 202 aims to ensure that in the case of power failure of the forklift or the driver leaving the seat, the connection between the multi-way valve group 1 and the oil circuit 203 can be automatically cut off, thereby effectively preventing misoperation and improving the safety and reliability of the forklift.

[0028] In this embodiment, the control element 202 adopts an electromagnetic valve, which is provided with a first oil port A and a second oil port B. The first oil port A is connected to the spool in the multi-way valve group 1 through the connecting structure to realize accurate control of the spool; the second oil port B is connected to the oil circuit 203 through the connecting structure to ensure the effective flow of hydraulic oil. The electromagnetic valve is connected to the current control switch, and the opening and closing of the internal valve are realized by the on-off of the current control switch. Specifically, the current control switch is installed on the forklift driver's seat. When the driver sits on the driver's seat, the current control switch is in the closed state, so that the electromagnetic valve works normally, and the hydraulic oil can flow smoothly to support various operation functions of the forklift. On the contrary, when the driver leaves the seat, the current control switch automatically cuts off the power supply of the electromagnetic valve, causing the valve to close and cut off the flow of hydraulic oil, thereby ensuring that the forklift will not start accidentally in an unsafe state. This design ensures that the hydraulic system of the forklift is in a safe state when the driver is not in place, avoiding unnecessary risks.

[0029] Moreover, the electromagnetic valve as an external independent device has wide applicability and is not limited by the type of forklift and the brand and specifications of the multi-way valve group, and can be used with almost all models of forklift multi-way valve groups to realize effective descent safety control. This design makes it possible for even some old forklifts to realize safety control function through modification. The working principle of the electromagnetic valve is simple, easy to implement, and low in cost. After the actual verification of multiple batches of forklift modifications, it shows significant safety improvement effect.

[0030] In other specific embodiments, the control element 202 can also adopt a manual shut-off valve or other mechanical locking device. When a manual shut-off valve is selected, the driver's cab of the forklift is also equipped with a sensor and an alarm. The main function of the sensor is to monitor the power status of the forklift and the seat occupancy of the driver in real time. When the sensor detects that the forklift is in a power-off state or the driver leaves the seat, the alarm will promptly send a prompt signal to remind the driver to manually close the manual shut-off valve to shut off the oil circuit 203. This design not only enhances the safety of forklift operation and prevents accidental start-up due to improper operation, but also ensures that the driver can take prompt measures in a non-safe state, thereby effectively reducing potential safety risks. In addition, the use of a manual shut-off valve provides an additional control means, allowing for quick shut-off of the hydraulic oil circuit in an emergency, further ensuring operational safety.

[0031] The multi-way valve group 1 is internally provided with four valve cores, and each valve core corresponds to a set of control mechanisms 2. Specifically, when the relevant personnel push the corresponding control handle 201, the corresponding valve core can be driven to move, thereby realizing control over the on-off state of the corresponding oil circuit 203. The present embodiment focuses on the lifting oil circuit, which is connected to the lifting oil cylinder. During the lifting process of the forklift, hydraulic oil flows from the multi-way valve group 1 to the second end of the control element 202 through the first end, and then smoothly flows into the lifting oil cylinder through the lifting oil circuit, thereby achieving the lifting function. During the lowering process of the forklift, the flow path of the hydraulic oil is exactly the opposite, i.e., from the lifting oil cylinder to the second end of the control element 202 through the lifting oil circuit, and then from the first end back to the multi-way valve group 1, and finally back to the oil tank. It should be noted that the oil circuit 203 in the present utility model is not limited to the lifting oil circuit, but can also be the tilting oil circuit, the side shifting oil circuit, or other types of oil circuits, which correspond to the tilting oil cylinder, the side shifting oil cylinder, or other oil cylinders, respectively, thereby meeting the hydraulic transmission needs of the forklift under different working conditions.

[0032] In addition, the control element 202 is connected to the multi-way valve group 1 and the oil circuit 203 through the transition joint, which makes the structure of the entire oil circuit system more compact, and while ensuring the stable connection of each component, facilitates installation, disassembly, and later maintenance and repair, thereby effectively ensuring the normal and efficient operation of the entire device.

[0033] Embodiment 2

[0034] A forward-moving forklift is provided, which comprises a vehicle body and the safety control device for the multi-way valve group of the forklift as described in embodiment 1, and the safety control device for the multi-way valve group 1 is installed on the vehicle body. Through this structural design, the operational safety of the forklift is significantly improved, ensuring that the hydraulic system of the forklift will not start unexpectedly in any non-safe state, thereby effectively preventing safety accidents caused by operational errors or equipment failures.

[0035] The utility model aims at effectively preventing the situation that the lifting oil cylinder and goods suddenly drop due to accidental touch of the joystick by human. To this end, an independent external control element 202 is additionally arranged to cut off the hydraulic oil circuit. In the case that the forklift is powered off or the driver leaves the seat, even if someone touches the joystick, the hydraulic oil in the lifting oil cylinder will not flow back to the multi-way valve group 1, thereby ensuring that the lifting oil cylinder and the goods will not drop. The control element 202 not only significantly enhances the operation safety of the forklift, but also provides an economical and effective solution for the safety modification of the forklift. By timely cutting off the hydraulic oil circuit, the device effectively prevents safety accidents caused by accidental situations, significantly improves the overall safety factor of the forklift, and ensures the safety of the operator and the surrounding environment.

[0036] It should be noted that, for those skilled in the art, the present utility model can be improved and modified in many ways without departing from the principles of the present utility model, and these improvements and modifications also fall within the scope of protection of the claims of the present utility model.

Claims

1. A safety control device for a multi-way valve group used in forklifts, characterized in that, The application relates to a safety control device for a multi-way valve group of a forklift truck. The safety control device comprises a multi-way valve group (1) provided with a plurality of valve spools, and connected to an oil tank through an oil port; at least one set of control mechanisms (2) comprising a control handle (201), a control element (202) and an oil circuit (203), the control handle (201) being connected to any valve spool in the multi-way valve group (1) through a connecting structure to control the movement of the valve spool; the first end of the control element (202) being connected to the valve spool, and the second end being connected to the oil circuit (203) which is further connected to an oil cylinder; the control element (202) being used to cut off the connection between the multi-way valve group (1) and the oil circuit (203) when the forklift truck is powered off or the driver leaves the seat. The control element (202) is an electromagnetic valve provided with a first oil port A and a second oil port B, the first oil port A being connected to the valve spool in the multi-way valve group (1) through a connecting structure, and the second oil port B being connected to the oil circuit (203) through a connecting structure. The electromagnetic valve is connected to a current control switch, and the opening and closing of the internal valve are realized by the on-off of the current control switch. The current control switch is installed on the driver seat of the forklift truck.

2. The apparatus of claim 1, wherein, The control element (202) is a manual stop valve, and the safety control device further comprises a sensor and an alarm arranged in the driver cabin of the forklift truck; the sensor is used to detect whether the forklift truck is powered off and whether the driver leaves the seat, and the alarm sends a prompt signal when the sensor detects that the forklift truck is powered off or the driver leaves the seat.

3. The apparatus of claim 1, wherein, The multi-way valve group (1) is provided with at least four valve spools, each of the valve spools corresponding to a set of control mechanisms (2), and the corresponding control handle (201) is pushed to drive the corresponding valve spool to move so as to control the on-off of the corresponding oil circuit (203).

4. The apparatus of claim 1, wherein, The oil circuit (203) at least comprises a lifting oil circuit, a tilting oil circuit or a side shifting oil circuit, and is respectively connected to a lifting oil cylinder, a tilting oil cylinder or a side shifting oil cylinder.

5. The apparatus of claim 4, wherein, The oil circuit (203) is a lifting oil circuit connected to a lifting oil cylinder; when lifting, hydraulic oil flows from the multi-way valve group (1) to the second end of the control element (202) through the first end, flows into the lifting oil cylinder through the lifting oil circuit to realize lifting; when descending, hydraulic oil flows from the lifting oil cylinder to the second end of the control element (202) through the lifting oil circuit, and then returns to the multi-way valve group (1) through the first end and flows back to the oil tank.

6. The apparatus of claim 5, wherein, The control element (202) is connected to the multi-way valve group (1) and the oil circuit (203) through a transition joint.

7. The apparatus of claim 1, wherein, The application further relates to a forklift truck comprising a vehicle body and the safety control device for the multi-way valve group of the forklift truck.

8. A reach truck, characterized in that ​

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